Initial commit: Add Months MVP

Local-first Flutter app that identifies the single behavioral change
most likely to extend lifespan using hazard-based modeling.

Features:
- Risk engine with hazard ratios from meta-analyses
- 50 countries mapped to 4 mortality groups
- 6 modifiable factors: smoking, alcohol, sleep, activity, driving, work hours
- SQLite local storage (no cloud, no accounts)
- Muted clinical UI theme
- 23 unit tests for risk engine

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,45 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

.metadata

@@ -0,0 +1,42 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "f6ff1529fd6d8af5f706051d9251ac9231c83407"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+    - platform: android
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+    - platform: ios
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+    - platform: linux
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+    - platform: macos
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+    - platform: web
+      create_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+      base_revision: f6ff1529fd6d8af5f706051d9251ac9231c83407
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

CLAUDE.md

@@ -0,0 +1,277 @@
+# Add Months
+
+Local-first Flutter app that identifies the single behavioral change most likely to extend lifespan using hazard-based modeling.
+
+## Quick Start
+
+```bash
+flutter pub get
+flutter test test/risk_engine/    # 23 unit tests
+flutter run                       # Debug mode
+flutter run --release -d <device> # Release build
+```
+
+## Architecture
+
+```
+lib/
+├── main.dart                 # App entry, routing logic
+├── theme.dart                # Muted clinical color palette
+├── models/
+│   ├── enums.dart            # Sex, SmokingStatus, AlcoholLevel, etc.
+│   ├── user_profile.dart     # Age, sex, country, height, weight, diagnoses
+│   ├── behavioral_inputs.dart # Modifiable behaviors
+│   └── result.dart           # LifespanDelta, RankedFactor, CalculationResult
+├── risk_engine/
+│   ├── hazard_ratios.dart    # HR constants from meta-analyses
+│   ├── mortality_tables.dart # 50 countries → 4 mortality groups
+│   └── calculator.dart       # Core ranking algorithm
+├── screens/
+│   ├── welcome_screen.dart   # Onboarding
+│   ├── baseline_screen.dart  # Demographics, BMI, conditions
+│   ├── behavioral_screen.dart # Modifiable factors input
+│   └── results_screen.dart   # Dominant challenge display
+└── storage/
+    └── local_storage.dart    # SQLite persistence
+```
+
+## Core Principles
+
+1. **Local-first**: All data on device, no cloud, no accounts, no analytics
+2. **Evidence-based**: Hazard ratios from peer-reviewed meta-analyses
+3. **Privacy**: Delete All Data = full wipe including encryption keys
+4. **Neutral tone**: "Exposure", "Factor", "Estimated gain" — no moral language
+
+## Risk Engine
+
+### Hazard Ratio Model
+
+Combined HR = Smoking × Alcohol × Sleep × Activity × BMI × Driving × WorkHours
+
+Capped at 4.0 to prevent unrealistic compounding.
+
+### Key Hazard Ratios
+
+| Factor | Level | HR |
+|--------|-------|-----|
+| Smoking | Never | 1.0 |
+| | Former | 1.3 |
+| | Current (<10/day) | 1.8 |
+| | Current (10-20/day) | 2.2 |
+| | Current (>20/day) | 2.8 |
+| Alcohol | None/Light | 1.0 |
+| | Moderate (8-14/wk) | 1.1 |
+| | Heavy (15-21/wk) | 1.3 |
+| | Very Heavy (21+/wk) | 1.6 |
+| Sleep | 7-8 hrs | 1.0 |
+| | 6-7 hrs | 1.05 |
+| | <6 hrs | 1.15 |
+| | >8 hrs | 1.10 |
+| | + Inconsistent | ×1.05 |
+| Activity | High | 1.0 |
+| | Moderate | 1.05 |
+| | Light | 1.15 |
+| | Sedentary | 1.4 |
+| BMI | 18.5-25 | 1.0 |
+| | 25-30 | 1.1 |
+| | 30-35 | 1.2 |
+| | 35-40 | 1.4 |
+| | 40+ | 1.8 |
+| Driving | <50 mi/wk | 1.0 |
+| | 50-150 | 1.02 |
+| | 150-300 | 1.04 |
+| | 300+ | 1.08 |
+| Work Hours | <40 | 1.0 |
+| | 40-55 | 1.05 |
+| | 55-70 | 1.15 |
+| | 70+ | 1.3 |
+
+### Existing Conditions (Non-modifiable)
+
+| Condition | HR Multiplier |
+|-----------|---------------|
+| Cardiovascular | 1.5 |
+| Diabetes | 1.4 |
+| Cancer (active) | 2.0 |
+| COPD | 1.6 |
+| Hypertension | 1.2 |
+
+### Delta Calculation
+
+```dart
+// Simplified Gompertz-style approximation
+rawDeltaYears = baselineYears × (1 - modifiedHR/currentHR) × 0.3
+
+// Convert to months with uncertainty range
+lowMonths = rawDeltaYears × 12 × 0.6
+highMonths = rawDeltaYears × 12 × 1.4
+```
+
+### Ranking Algorithm
+
+1. For each modifiable behavior:
+   - Compute HR with behavior set to optimal
+   - Calculate delta months gained
+2. Sort by midpoint delta descending
+3. Filter out behaviors already at optimal
+4. Return ranked list with confidence levels
+
+### Confidence Levels
+
+| Factor | Confidence | Rationale |
+|--------|------------|-----------|
+| Smoking | High | Extremely well-documented |
+| Alcohol (heavy) | High | Strong epidemiological data |
+| Physical Activity | High | Large meta-analyses |
+| BMI (extreme) | High | Well-established |
+| Sleep | Moderate | Growing evidence, some confounding |
+| Work Hours | Moderate | Decent studies, cultural variation |
+| Driving | Emerging | Harder to isolate, regional variation |
+
+## Mortality Tables
+
+### Country Groups
+
+| Group | LE at Birth (M) | Countries |
+|-------|-----------------|-----------|
+| A | 81 | Japan, Switzerland, Singapore, Spain, Italy, Australia, Iceland, Israel, Sweden, France, South Korea, Norway |
+| B | 77 | USA, UK, Germany, Canada, Netherlands, Belgium, Austria, Finland, Ireland, New Zealand, Denmark, Portugal, Czech Republic, Poland, Chile, Costa Rica, Cuba, UAE, Qatar, Taiwan |
+| C | 72 | China, Brazil, Mexico, Russia, Turkey, Argentina, Colombia, Thailand, Vietnam, Malaysia, Iran, Saudi Arabia, Egypt, Ukraine, Romania, Hungary, Peru, Philippines |
+| D | 65 | India, Indonesia, South Africa, Pakistan, Bangladesh, Nigeria, Kenya, Ghana, Ethiopia, Myanmar, Nepal, Cambodia |
+
+Female LE = Male LE + 4.5 years
+
+### Remaining Life Expectancy
+
+```dart
+// Survivors have higher LE than birth cohort suggests
+survivorBonus = currentAge × 0.15  // capped at 5
+remainingLE = (leAtBirth - currentAge) + survivorBonus
+```
+
+## Storage
+
+### SQLite Schema
+
+```sql
+CREATE TABLE user_data (
+  key TEXT PRIMARY KEY,
+  value TEXT NOT NULL,      -- JSON
+  updated_at INTEGER NOT NULL
+)
+```
+
+### Stored Keys
+
+- `profile`: UserProfile JSON
+- `behaviors`: BehavioralInputs JSON
+- `lastResult`: CalculationResult JSON
+
+### Delete All Data
+
+```dart
+await db.delete('user_data');  // Wipes all rows
+```
+
+## UI Theme
+
+### Colors (Muted Clinical)
+
+```dart
+primary:       #4A90A4  // Muted teal
+primaryDark:   #2D6073
+primaryLight:  #7BB8CC
+surface:       #F8FAFB
+textPrimary:   #1A2B33
+textSecondary: #5A6B73
+success:       #4A9A7C
+warning:       #B8934A
+error:         #A45A5A
+```
+
+### Typography
+
+- Headlines: SF Pro Display style, tight letter-spacing
+- Body: 16px, 1.5 line height
+- Labels: 600 weight
+
+## Testing
+
+```bash
+# Run all risk engine tests
+flutter test test/risk_engine/
+
+# 23 tests covering:
+# - Hazard ratios for each behavior
+# - Mortality table lookups
+# - Combined HR calculation
+# - Ranking algorithm
+# - Confidence assignments
+# - Existing conditions impact
+```
+
+Widget tests require SQLite mocking — integration test on device.
+
+## App Icon
+
+Generated programmatically: muted teal tree on white background.
+
+```bash
+dart run tool/generate_icon.dart
+dart run flutter_launcher_icons
+```
+
+## Model Versioning
+
+```dart
+const modelVersion = '1.0';
+```
+
+Stored with each calculation result. Future updates can show:
+"Results updated under model v1.1"
+
+## Screen Flow
+
+```
+Welcome → Baseline → Behavioral → Results
+              ↑                      ↓
+              └────── Recalculate ───┘
+```
+
+Results screen shows:
+- Dominant Challenge (largest gain)
+- Estimated Gain range (e.g., "36-60 months")
+- Confidence level (High/Moderate/Emerging)
+- Secondary factor
+- All other factors (if any)
+- Delete All Data button
+
+## Key Design Decisions
+
+1. **BMI is baseline only** — affects calculation but not shown as a "challenge"
+2. **Cigarettes/day** — slider with haptic at 20 (one pack), max 40
+3. **Country** — full dropdown (50 countries), mapped internally to groups
+4. **No gamification** — no streaks, badges, or progress tracking
+5. **No notifications** — user controls when to recalculate
+
+## Dependencies
+
+```yaml
+dependencies:
+  sqflite: ^2.3.0         # Local database
+  path: ^1.8.3            # Path utilities
+  flutter_secure_storage: # Encryption key storage (future)
+
+dev_dependencies:
+  flutter_launcher_icons: ^0.14.1
+```
+
+## Future Enhancements (Out of MVP Scope)
+
+- Partner mode (compare two profiles)
+- Export PDF summary
+- Drug use factor
+- Diet quality factor
+- Stress/mental health factor
+- Location-based mortality refinement
+- Longitudinal tracking

README.md

@@ -0,0 +1,16 @@
+# add_months
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

analysis_options.yaml

@@ -0,0 +1,28 @@
+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

android/app/build.gradle.kts

@@ -0,0 +1,44 @@
+plugins {
+    id("com.android.application")
+    id("kotlin-android")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+android {
+    namespace = "com.payfrit.add_months"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_17.toString()
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId = "com.payfrit.add_months"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+}
+
+flutter {
+    source = "../.."
+}

android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,45 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="add_months"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

android/app/src/main/kotlin/com/payfrit/add_months/MainActivity.kt

@@ -0,0 +1,5 @@
+package com.payfrit.add_months
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : FlutterActivity()

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@color/ic_launcher_background"/>
+  <foreground>
+      <inset
+          android:drawable="@drawable/ic_launcher_foreground"
+          android:inset="16%" />
+  </foreground>
+</adaptive-icon>

android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#FFFFFF</color>
+</resources>

android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android/build.gradle.kts

@@ -0,0 +1,24 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+val newBuildDir: Directory =
+    rootProject.layout.buildDirectory
+        .dir("../../build")
+        .get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}

android/gradle.properties

@@ -0,0 +1,2 @@
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip

android/settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    val flutterSdkPath =
+        run {
+            val properties = java.util.Properties()
+            file("local.properties").inputStream().use { properties.load(it) }
+            val flutterSdkPath = properties.getProperty("flutter.sdk")
+            require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
+            flutterSdkPath
+        }
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
+    id("com.android.application") version "8.11.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
+}
+
+include(":app")

ios/.gitignore

@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>13.0</string>
+</dict>
+</plist>

ios/Flutter/Debug.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

ios/Flutter/Release.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,616 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 54;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		331C808B294A63AB00263BE5 /* RunnerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 331C807B294A618700263BE5 /* RunnerTests.swift */; };
+		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
+		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXContainerItemProxy section */
+		331C8085294A63A400263BE5 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 97C146E61CF9000F007C117D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 97C146ED1CF9000F007C117D;
+			remoteInfo = Runner;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		331C807B294A618700263BE5 /* RunnerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RunnerTests.swift; sourceTree = "<group>"; };
+		331C8081294A63A400263BE5 /* RunnerTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = RunnerTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
+		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
+		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
+		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
+		97C146EE1CF9000F007C117D /* Runner.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Runner.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		97C146FB1CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		97C146EB1CF9000F007C117D /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		331C8082294A63A400263BE5 /* RunnerTests */ = {
+			isa = PBXGroup;
+			children = (
+				331C807B294A618700263BE5 /* RunnerTests.swift */,
+			);
+			path = RunnerTests;
+			sourceTree = "<group>";
+		};
+		9740EEB11CF90186004384FC /* Flutter */ = {
+			isa = PBXGroup;
+			children = (
+				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
+				9740EEB21CF90195004384FC /* Debug.xcconfig */,
+				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
+				9740EEB31CF90195004384FC /* Generated.xcconfig */,
+			);
+			name = Flutter;
+			sourceTree = "<group>";
+		};
+		97C146E51CF9000F007C117D = {
+			isa = PBXGroup;
+			children = (
+				9740EEB11CF90186004384FC /* Flutter */,
+				97C146F01CF9000F007C117D /* Runner */,
+				97C146EF1CF9000F007C117D /* Products */,
+				331C8082294A63A400263BE5 /* RunnerTests */,
+			);
+			sourceTree = "<group>";
+		};
+		97C146EF1CF9000F007C117D /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				97C146EE1CF9000F007C117D /* Runner.app */,
+				331C8081294A63A400263BE5 /* RunnerTests.xctest */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		97C146F01CF9000F007C117D /* Runner */ = {
+			isa = PBXGroup;
+			children = (
+				97C146FA1CF9000F007C117D /* Main.storyboard */,
+				97C146FD1CF9000F007C117D /* Assets.xcassets */,
+				97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */,
+				97C147021CF9000F007C117D /* Info.plist */,
+				1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */,
+				1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */,
+				74858FAE1ED2DC5600515810 /* AppDelegate.swift */,
+				74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */,
+			);
+			path = Runner;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		331C8080294A63A400263BE5 /* RunnerTests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */;
+			buildPhases = (
+				331C807D294A63A400263BE5 /* Sources */,
+				331C807F294A63A400263BE5 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				331C8086294A63A400263BE5 /* PBXTargetDependency */,
+			);
+			name = RunnerTests;
+			productName = RunnerTests;
+			productReference = 331C8081294A63A400263BE5 /* RunnerTests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
+		};
+		97C146ED1CF9000F007C117D /* Runner */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
+			buildPhases = (
+				9740EEB61CF901F6004384FC /* Run Script */,
+				97C146EA1CF9000F007C117D /* Sources */,
+				97C146EB1CF9000F007C117D /* Frameworks */,
+				97C146EC1CF9000F007C117D /* Resources */,
+				9705A1C41CF9048500538489 /* Embed Frameworks */,
+				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Runner;
+			productName = Runner;
+			productReference = 97C146EE1CF9000F007C117D /* Runner.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		97C146E61CF9000F007C117D /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = YES;
+				LastUpgradeCheck = 1510;
+				ORGANIZATIONNAME = "";
+				TargetAttributes = {
+					331C8080294A63A400263BE5 = {
+						CreatedOnToolsVersion = 14.0;
+						TestTargetID = 97C146ED1CF9000F007C117D;
+					};
+					97C146ED1CF9000F007C117D = {
+						CreatedOnToolsVersion = 7.3.1;
+						LastSwiftMigration = 1100;
+					};
+				};
+			};
+			buildConfigurationList = 97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */;
+			compatibilityVersion = "Xcode 9.3";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 97C146E51CF9000F007C117D;
+			productRefGroup = 97C146EF1CF9000F007C117D /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				97C146ED1CF9000F007C117D /* Runner */,
+				331C8080294A63A400263BE5 /* RunnerTests */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		331C807F294A63A400263BE5 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		97C146EC1CF9000F007C117D /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
+				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
+				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
+				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXShellScriptBuildPhase section */
+		3B06AD1E1E4923F5004D2608 /* Thin Binary */ = {
+			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+				"${TARGET_BUILD_DIR}/${INFOPLIST_PATH}",
+			);
+			name = "Thin Binary";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
+		};
+		9740EEB61CF901F6004384FC /* Run Script */ = {
+			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Run Script";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
+		};
+/* End PBXShellScriptBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		331C807D294A63A400263BE5 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				331C808B294A63AB00263BE5 /* RunnerTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+		97C146EA1CF9000F007C117D /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
+				1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXTargetDependency section */
+		331C8086294A63A400263BE5 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 97C146ED1CF9000F007C117D /* Runner */;
+			targetProxy = 331C8085294A63A400263BE5 /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
+/* Begin PBXVariantGroup section */
+		97C146FA1CF9000F007C117D /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				97C146FB1CF9000F007C117D /* Base */,
+			);
+			name = Main.storyboard;
+			sourceTree = "<group>";
+		};
+		97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				97C147001CF9000F007C117D /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		249021D3217E4FDB00AE95B9 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				SUPPORTED_PLATFORMS = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Profile;
+		};
+		249021D4217E4FDB00AE95B9 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Profile;
+		};
+		331C8088294A63A400263BE5 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Debug;
+		};
+		331C8089294A63A400263BE5 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Release;
+		};
+		331C808A294A63A400263BE5 /* Profile */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				BUNDLE_LOADER = "$(TEST_HOST)";
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				GENERATE_INFOPLIST_FILE = YES;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths.RunnerTests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/Runner.app/$(BUNDLE_EXECUTABLE_FOLDER_PATH)/Runner";
+			};
+			name = Profile;
+		};
+		97C147031CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = AppIcon;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		97C147041CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = AppIcon;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				SUPPORTED_PLATFORMS = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		97C147061CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.payfrit.addMonths;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				331C8088294A63A400263BE5 /* Debug */,
+				331C8089294A63A400263BE5 /* Release */,
+				331C808A294A63A400263BE5 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1510"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

ios/Runner/AppDelegate.swift

@@ -0,0 +1,13 @@
+import Flutter
+import UIKit
+
+@main
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1 @@
+{"images":[{"size":"20x20","idiom":"iphone","filename":"Icon-App-20x20@2x.png","scale":"2x"},{"size":"20x20","idiom":"iphone","filename":"Icon-App-20x20@3x.png","scale":"3x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@1x.png","scale":"1x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@2x.png","scale":"2x"},{"size":"29x29","idiom":"iphone","filename":"Icon-App-29x29@3x.png","scale":"3x"},{"size":"40x40","idiom":"iphone","filename":"Icon-App-40x40@2x.png","scale":"2x"},{"size":"40x40","idiom":"iphone","filename":"Icon-App-40x40@3x.png","scale":"3x"},{"size":"57x57","idiom":"iphone","filename":"Icon-App-57x57@1x.png","scale":"1x"},{"size":"57x57","idiom":"iphone","filename":"Icon-App-57x57@2x.png","scale":"2x"},{"size":"60x60","idiom":"iphone","filename":"Icon-App-60x60@2x.png","scale":"2x"},{"size":"60x60","idiom":"iphone","filename":"Icon-App-60x60@3x.png","scale":"3x"},{"size":"20x20","idiom":"ipad","filename":"Icon-App-20x20@1x.png","scale":"1x"},{"size":"20x20","idiom":"ipad","filename":"Icon-App-20x20@2x.png","scale":"2x"},{"size":"29x29","idiom":"ipad","filename":"Icon-App-29x29@1x.png","scale":"1x"},{"size":"29x29","idiom":"ipad","filename":"Icon-App-29x29@2x.png","scale":"2x"},{"size":"40x40","idiom":"ipad","filename":"Icon-App-40x40@1x.png","scale":"1x"},{"size":"40x40","idiom":"ipad","filename":"Icon-App-40x40@2x.png","scale":"2x"},{"size":"50x50","idiom":"ipad","filename":"Icon-App-50x50@1x.png","scale":"1x"},{"size":"50x50","idiom":"ipad","filename":"Icon-App-50x50@2x.png","scale":"2x"},{"size":"72x72","idiom":"ipad","filename":"Icon-App-72x72@1x.png","scale":"1x"},{"size":"72x72","idiom":"ipad","filename":"Icon-App-72x72@2x.png","scale":"2x"},{"size":"76x76","idiom":"ipad","filename":"Icon-App-76x76@1x.png","scale":"1x"},{"size":"76x76","idiom":"ipad","filename":"Icon-App-76x76@2x.png","scale":"2x"},{"size":"83.5x83.5","idiom":"ipad","filename":"Icon-App-83.5x83.5@2x.png","scale":"2x"},{"size":"1024x1024","idiom":"ios-marketing","filename":"Icon-App-1024x1024@1x.png","scale":"1x"}],"info":{"version":1,"author":"xcode"}}

ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

ios/Runner/Info.plist

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Add Months</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>add_months</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+</dict>
+</plist>

ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

ios/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}

lib/main.dart

@@ -0,0 +1,107 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'screens/screens.dart';
+import 'storage/local_storage.dart';
+import 'theme.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  // Initialize database
+  await LocalStorage.database;
+
+  // Set preferred orientations
+  await SystemChrome.setPreferredOrientations([
+    DeviceOrientation.portraitUp,
+    DeviceOrientation.portraitDown,
+  ]);
+
+  runApp(const AddMonthsApp());
+}
+
+class AddMonthsApp extends StatelessWidget {
+  const AddMonthsApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Add Months',
+      debugShowCheckedModeBanner: false,
+      theme: buildAppTheme(),
+      home: const AppRouter(),
+    );
+  }
+}
+
+class AppRouter extends StatefulWidget {
+  const AppRouter({super.key});
+
+  @override
+  State<AppRouter> createState() => _AppRouterState();
+}
+
+class _AppRouterState extends State<AppRouter> {
+  bool _loading = true;
+  bool _hasData = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _checkExistingData();
+  }
+
+  Future<void> _checkExistingData() async {
+    final hasData = await LocalStorage.hasCompletedSetup();
+    setState(() {
+      _hasData = hasData;
+      _loading = false;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_loading) {
+      return const Scaffold(
+        body: Center(
+          child: CircularProgressIndicator(),
+        ),
+      );
+    }
+
+    // If user has existing data, go straight to results
+    if (_hasData) {
+      return FutureBuilder(
+        future: _loadExistingData(),
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return const Scaffold(
+              body: Center(child: CircularProgressIndicator()),
+            );
+          }
+
+          if (snapshot.hasData) {
+            final data = snapshot.data!;
+            return ResultsScreen(
+              profile: data.$1,
+              behaviors: data.$2,
+            );
+          }
+
+          return const WelcomeScreen();
+        },
+      );
+    }
+
+    return const WelcomeScreen();
+  }
+
+  Future<(dynamic, dynamic)?> _loadExistingData() async {
+    final profile = await LocalStorage.getProfile();
+    final behaviors = await LocalStorage.getBehaviors();
+
+    if (profile != null && behaviors != null) {
+      return (profile, behaviors);
+    }
+    return null;
+  }
+}

lib/models/behavioral_inputs.dart

@@ -0,0 +1,78 @@
+import 'enums.dart';
+
+class BehavioralInputs {
+  final SmokingStatus smoking;
+  final int cigarettesPerDay; // only relevant if smoking == current
+  final AlcoholLevel alcohol;
+  final double sleepHours;
+  final bool sleepConsistent;
+  final ActivityLevel activity;
+  final DrivingExposure driving;
+  final WorkHoursLevel workHours;
+
+  const BehavioralInputs({
+    required this.smoking,
+    this.cigarettesPerDay = 0,
+    required this.alcohol,
+    required this.sleepHours,
+    required this.sleepConsistent,
+    required this.activity,
+    required this.driving,
+    required this.workHours,
+  });
+
+  static const optimal = BehavioralInputs(
+    smoking: SmokingStatus.never,
+    cigarettesPerDay: 0,
+    alcohol: AlcoholLevel.none,
+    sleepHours: 7.5,
+    sleepConsistent: true,
+    activity: ActivityLevel.high,
+    driving: DrivingExposure.low,
+    workHours: WorkHoursLevel.normal,
+  );
+
+  Map<String, dynamic> toJson() => {
+        'smoking': smoking.name,
+        'cigarettesPerDay': cigarettesPerDay,
+        'alcohol': alcohol.name,
+        'sleepHours': sleepHours,
+        'sleepConsistent': sleepConsistent,
+        'activity': activity.name,
+        'driving': driving.name,
+        'workHours': workHours.name,
+      };
+
+  factory BehavioralInputs.fromJson(Map<String, dynamic> json) =>
+      BehavioralInputs(
+        smoking: SmokingStatus.values.byName(json['smoking'] as String),
+        cigarettesPerDay: json['cigarettesPerDay'] as int? ?? 0,
+        alcohol: AlcoholLevel.values.byName(json['alcohol'] as String),
+        sleepHours: (json['sleepHours'] as num).toDouble(),
+        sleepConsistent: json['sleepConsistent'] as bool,
+        activity: ActivityLevel.values.byName(json['activity'] as String),
+        driving: DrivingExposure.values.byName(json['driving'] as String),
+        workHours: WorkHoursLevel.values.byName(json['workHours'] as String),
+      );
+
+  BehavioralInputs copyWith({
+    SmokingStatus? smoking,
+    int? cigarettesPerDay,
+    AlcoholLevel? alcohol,
+    double? sleepHours,
+    bool? sleepConsistent,
+    ActivityLevel? activity,
+    DrivingExposure? driving,
+    WorkHoursLevel? workHours,
+  }) =>
+      BehavioralInputs(
+        smoking: smoking ?? this.smoking,
+        cigarettesPerDay: cigarettesPerDay ?? this.cigarettesPerDay,
+        alcohol: alcohol ?? this.alcohol,
+        sleepHours: sleepHours ?? this.sleepHours,
+        sleepConsistent: sleepConsistent ?? this.sleepConsistent,
+        activity: activity ?? this.activity,
+        driving: driving ?? this.driving,
+        workHours: workHours ?? this.workHours,
+      );
+}

lib/models/enums.dart

@@ -0,0 +1,15 @@
+enum Sex { male, female }
+
+enum SmokingStatus { never, former, current }
+
+enum AlcoholLevel { none, light, moderate, heavy, veryHeavy }
+
+enum ActivityLevel { sedentary, light, moderate, high }
+
+enum DrivingExposure { low, moderate, high, veryHigh }
+
+enum WorkHoursLevel { normal, elevated, high, extreme }
+
+enum Diagnosis { cardiovascular, diabetes, cancer, copd, hypertension }
+
+enum Confidence { high, moderate, emerging }

lib/models/models.dart

@@ -0,0 +1,4 @@
+export 'enums.dart';
+export 'user_profile.dart';
+export 'behavioral_inputs.dart';
+export 'result.dart';

lib/models/result.dart

@@ -0,0 +1,90 @@
+import 'enums.dart';
+
+class LifespanDelta {
+  final int lowMonths;
+  final int highMonths;
+  final Confidence confidence;
+
+  const LifespanDelta({
+    required this.lowMonths,
+    required this.highMonths,
+    required this.confidence,
+  });
+
+  int get midpointMonths => ((lowMonths + highMonths) / 2).round();
+
+  String get rangeDisplay {
+    if (lowMonths <= 0 && highMonths <= 0) return '0';
+    if (lowMonths == highMonths) return '$lowMonths';
+    return '$lowMonths–$highMonths';
+  }
+
+  Map<String, dynamic> toJson() => {
+        'lowMonths': lowMonths,
+        'highMonths': highMonths,
+        'confidence': confidence.name,
+      };
+
+  factory LifespanDelta.fromJson(Map<String, dynamic> json) => LifespanDelta(
+        lowMonths: json['lowMonths'] as int,
+        highMonths: json['highMonths'] as int,
+        confidence: Confidence.values.byName(json['confidence'] as String),
+      );
+}
+
+class RankedFactor {
+  final String behaviorKey;
+  final String displayName;
+  final LifespanDelta delta;
+
+  const RankedFactor({
+    required this.behaviorKey,
+    required this.displayName,
+    required this.delta,
+  });
+
+  Map<String, dynamic> toJson() => {
+        'behaviorKey': behaviorKey,
+        'displayName': displayName,
+        'delta': delta.toJson(),
+      };
+
+  factory RankedFactor.fromJson(Map<String, dynamic> json) => RankedFactor(
+        behaviorKey: json['behaviorKey'] as String,
+        displayName: json['displayName'] as String,
+        delta: LifespanDelta.fromJson(json['delta'] as Map<String, dynamic>),
+      );
+}
+
+class CalculationResult {
+  final List<RankedFactor> rankedFactors;
+  final String modelVersion;
+  final DateTime calculatedAt;
+
+  const CalculationResult({
+    required this.rankedFactors,
+    required this.modelVersion,
+    required this.calculatedAt,
+  });
+
+  RankedFactor? get dominantFactor =>
+      rankedFactors.isNotEmpty ? rankedFactors.first : null;
+
+  RankedFactor? get secondaryFactor =>
+      rankedFactors.length > 1 ? rankedFactors[1] : null;
+
+  Map<String, dynamic> toJson() => {
+        'rankedFactors': rankedFactors.map((f) => f.toJson()).toList(),
+        'modelVersion': modelVersion,
+        'calculatedAt': calculatedAt.toIso8601String(),
+      };
+
+  factory CalculationResult.fromJson(Map<String, dynamic> json) =>
+      CalculationResult(
+        rankedFactors: (json['rankedFactors'] as List<dynamic>)
+            .map((f) => RankedFactor.fromJson(f as Map<String, dynamic>))
+            .toList(),
+        modelVersion: json['modelVersion'] as String,
+        calculatedAt: DateTime.parse(json['calculatedAt'] as String),
+      );
+}

lib/models/user_profile.dart

@@ -0,0 +1,58 @@
+import 'enums.dart';
+
+class UserProfile {
+  final int age;
+  final Sex sex;
+  final String country;
+  final double heightCm;
+  final double weightKg;
+  final Set<Diagnosis> diagnoses;
+
+  const UserProfile({
+    required this.age,
+    required this.sex,
+    required this.country,
+    required this.heightCm,
+    required this.weightKg,
+    this.diagnoses = const {},
+  });
+
+  double get bmi => weightKg / ((heightCm / 100) * (heightCm / 100));
+
+  Map<String, dynamic> toJson() => {
+        'age': age,
+        'sex': sex.name,
+        'country': country,
+        'heightCm': heightCm,
+        'weightKg': weightKg,
+        'diagnoses': diagnoses.map((d) => d.name).toList(),
+      };
+
+  factory UserProfile.fromJson(Map<String, dynamic> json) => UserProfile(
+        age: json['age'] as int,
+        sex: Sex.values.byName(json['sex'] as String),
+        country: json['country'] as String,
+        heightCm: (json['heightCm'] as num).toDouble(),
+        weightKg: (json['weightKg'] as num).toDouble(),
+        diagnoses: (json['diagnoses'] as List<dynamic>)
+            .map((d) => Diagnosis.values.byName(d as String))
+            .toSet(),
+      );
+
+  UserProfile copyWith({
+    int? age,
+    Sex? sex,
+    String? country,
+    double? heightCm,
+    double? weightKg,
+    Set<Diagnosis>? diagnoses,
+  }) =>
+      UserProfile(
+        age: age ?? this.age,
+        sex: sex ?? this.sex,
+        country: country ?? this.country,
+        heightCm: heightCm ?? this.heightCm,
+        weightKg: weightKg ?? this.weightKg,
+        diagnoses: diagnoses ?? this.diagnoses,
+      );
+}

lib/risk_engine/calculator.dart

@@ -0,0 +1,176 @@
+import 'dart:math';
+import '../models/models.dart';
+import 'hazard_ratios.dart';
+import 'mortality_tables.dart';
+
+const String modelVersion = '1.0';
+
+/// Maximum combined hazard ratio (prevents unrealistic compounding).
+const double _maxCombinedHR = 4.0;
+
+/// Damping factor for delta calculation (conservative estimate).
+const double _dampingFactor = 0.3;
+
+/// Uncertainty range multipliers.
+const double _lowMultiplier = 0.6;
+const double _highMultiplier = 1.4;
+
+/// Calculate combined hazard ratio from behavioral inputs.
+double computeCombinedHazard(BehavioralInputs inputs, double bmi) {
+  double hr = 1.0;
+
+  hr *= getSmokingHR(inputs.smoking, inputs.cigarettesPerDay);
+  hr *= getAlcoholHR(inputs.alcohol);
+  hr *= getSleepHR(inputs.sleepHours, inputs.sleepConsistent);
+  hr *= getActivityHR(inputs.activity);
+  hr *= getBmiHR(bmi);
+  hr *= getDrivingHR(inputs.driving);
+  hr *= getWorkHoursHR(inputs.workHours);
+
+  return min(hr, _maxCombinedHR);
+}
+
+/// Calculate lifespan delta when modifying a behavior to optimal.
+LifespanDelta _computeDelta(
+  double baselineYears,
+  double currentHR,
+  double modifiedHR,
+  String behaviorKey,
+) {
+  if (currentHR <= modifiedHR) {
+    // No improvement possible or already optimal
+    return LifespanDelta(
+      lowMonths: 0,
+      highMonths: 0,
+      confidence: getConfidenceForBehavior(behaviorKey),
+    );
+  }
+
+  // Delta years ≈ baselineYears × (1 - modifiedHR/currentHR) × dampingFactor
+  final rawDeltaYears =
+      baselineYears * (1 - modifiedHR / currentHR) * _dampingFactor;
+
+  // Convert to months with uncertainty range
+  final midpointMonths = rawDeltaYears * 12;
+  final lowMonths = (midpointMonths * _lowMultiplier).round();
+  final highMonths = (midpointMonths * _highMultiplier).round();
+
+  return LifespanDelta(
+    lowMonths: max(0, lowMonths),
+    highMonths: max(0, highMonths),
+    confidence: getConfidenceForBehavior(behaviorKey),
+  );
+}
+
+/// Get modified inputs with a specific behavior set to optimal.
+BehavioralInputs _setToOptimal(BehavioralInputs inputs, String behaviorKey) {
+  switch (behaviorKey) {
+    case 'smoking':
+      return inputs.copyWith(
+        smoking: SmokingStatus.never,
+        cigarettesPerDay: 0,
+      );
+    case 'alcohol':
+      return inputs.copyWith(alcohol: AlcoholLevel.none);
+    case 'sleep':
+      return inputs.copyWith(sleepHours: 7.5, sleepConsistent: true);
+    case 'activity':
+      return inputs.copyWith(activity: ActivityLevel.high);
+    case 'driving':
+      return inputs.copyWith(driving: DrivingExposure.low);
+    case 'workHours':
+      return inputs.copyWith(workHours: WorkHoursLevel.normal);
+    default:
+      return inputs;
+  }
+}
+
+/// Check if a behavior is already at optimal level.
+bool _isOptimal(BehavioralInputs inputs, String behaviorKey) {
+  switch (behaviorKey) {
+    case 'smoking':
+      return inputs.smoking == SmokingStatus.never;
+    case 'alcohol':
+      return inputs.alcohol == AlcoholLevel.none ||
+          inputs.alcohol == AlcoholLevel.light;
+    case 'sleep':
+      return inputs.sleepHours >= 7 &&
+          inputs.sleepHours <= 8 &&
+          inputs.sleepConsistent;
+    case 'activity':
+      return inputs.activity == ActivityLevel.high;
+    case 'driving':
+      return inputs.driving == DrivingExposure.low;
+    case 'workHours':
+      return inputs.workHours == WorkHoursLevel.normal;
+    default:
+      return true;
+  }
+}
+
+/// List of modifiable behavior keys.
+const _modifiableBehaviors = [
+  'smoking',
+  'alcohol',
+  'sleep',
+  'activity',
+  'driving',
+  'workHours',
+];
+
+/// Calculate ranked factors for a user profile and behavioral inputs.
+CalculationResult calculateRankedFactors(
+  UserProfile profile,
+  BehavioralInputs inputs,
+) {
+  // Get baseline remaining life expectancy
+  final baselineYears = getRemainingLifeExpectancy(
+    profile.age,
+    profile.sex,
+    profile.country,
+  );
+
+  // Apply existing condition modifiers (reduces baseline)
+  final conditionHR = getDiagnosisHR(profile.diagnoses);
+  final adjustedBaselineYears = baselineYears / conditionHR;
+
+  // Calculate current combined HR from behaviors
+  final currentHR = computeCombinedHazard(inputs, profile.bmi);
+
+  // Calculate delta for each modifiable behavior
+  final factors = <RankedFactor>[];
+
+  for (final behaviorKey in _modifiableBehaviors) {
+    // Skip if already optimal
+    if (_isOptimal(inputs, behaviorKey)) continue;
+
+    // Compute HR with this behavior set to optimal
+    final modifiedInputs = _setToOptimal(inputs, behaviorKey);
+    final modifiedHR = computeCombinedHazard(modifiedInputs, profile.bmi);
+
+    final delta = _computeDelta(
+      adjustedBaselineYears,
+      currentHR,
+      modifiedHR,
+      behaviorKey,
+    );
+
+    // Only include if there's meaningful gain (> 1 month)
+    if (delta.highMonths >= 1) {
+      factors.add(RankedFactor(
+        behaviorKey: behaviorKey,
+        displayName: getDisplayName(behaviorKey),
+        delta: delta,
+      ));
+    }
+  }
+
+  // Sort by midpoint delta descending
+  factors.sort((a, b) => b.delta.midpointMonths.compareTo(a.delta.midpointMonths));
+
+  return CalculationResult(
+    rankedFactors: factors,
+    modelVersion: modelVersion,
+    calculatedAt: DateTime.now(),
+  );
+}

lib/risk_engine/hazard_ratios.dart

@@ -0,0 +1,163 @@
+import '../models/models.dart';
+
+/// Hazard ratios based on conservative estimates from meta-analyses.
+/// All HRs are relative to optimal baseline (HR = 1.0).
+
+double getSmokingHR(SmokingStatus status, int cigarettesPerDay) {
+  switch (status) {
+    case SmokingStatus.never:
+      return 1.0;
+    case SmokingStatus.former:
+      return 1.3;
+    case SmokingStatus.current:
+      if (cigarettesPerDay < 10) return 1.8;
+      if (cigarettesPerDay <= 20) return 2.2;
+      return 2.8;
+  }
+}
+
+double getAlcoholHR(AlcoholLevel level) {
+  switch (level) {
+    case AlcoholLevel.none:
+    case AlcoholLevel.light:
+      return 1.0;
+    case AlcoholLevel.moderate:
+      return 1.1;
+    case AlcoholLevel.heavy:
+      return 1.3;
+    case AlcoholLevel.veryHeavy:
+      return 1.6;
+  }
+}
+
+double getSleepHR(double hours, bool consistent) {
+  double hr;
+  if (hours >= 7 && hours <= 8) {
+    hr = 1.0;
+  } else if (hours >= 6 && hours < 7) {
+    hr = 1.05;
+  } else if (hours < 6) {
+    hr = 1.15;
+  } else {
+    // > 8 hours
+    hr = 1.10;
+  }
+
+  // Inconsistent sleep schedule adds additional risk
+  if (!consistent) {
+    hr *= 1.05;
+  }
+
+  return hr;
+}
+
+double getActivityHR(ActivityLevel level) {
+  switch (level) {
+    case ActivityLevel.high:
+      return 1.0;
+    case ActivityLevel.moderate:
+      return 1.05;
+    case ActivityLevel.light:
+      return 1.15;
+    case ActivityLevel.sedentary:
+      return 1.4;
+  }
+}
+
+double getBmiHR(double bmi) {
+  if (bmi >= 18.5 && bmi < 25) return 1.0;
+  if (bmi >= 25 && bmi < 30) return 1.1;
+  if (bmi >= 30 && bmi < 35) return 1.2;
+  if (bmi >= 35 && bmi < 40) return 1.4;
+  if (bmi >= 40) return 1.8;
+  // Underweight
+  return 1.15;
+}
+
+double getDrivingHR(DrivingExposure level) {
+  switch (level) {
+    case DrivingExposure.low:
+      return 1.0;
+    case DrivingExposure.moderate:
+      return 1.02;
+    case DrivingExposure.high:
+      return 1.04;
+    case DrivingExposure.veryHigh:
+      return 1.08;
+  }
+}
+
+double getWorkHoursHR(WorkHoursLevel level) {
+  switch (level) {
+    case WorkHoursLevel.normal:
+      return 1.0;
+    case WorkHoursLevel.elevated:
+      return 1.05;
+    case WorkHoursLevel.high:
+      return 1.15;
+    case WorkHoursLevel.extreme:
+      return 1.3;
+  }
+}
+
+/// Existing conditions modify baseline mortality but are NOT modifiable.
+double getDiagnosisHR(Set<Diagnosis> diagnoses) {
+  double hr = 1.0;
+  for (final diagnosis in diagnoses) {
+    switch (diagnosis) {
+      case Diagnosis.cardiovascular:
+        hr *= 1.5;
+        break;
+      case Diagnosis.diabetes:
+        hr *= 1.4;
+        break;
+      case Diagnosis.cancer:
+        hr *= 2.0;
+        break;
+      case Diagnosis.copd:
+        hr *= 1.6;
+        break;
+      case Diagnosis.hypertension:
+        hr *= 1.2;
+        break;
+    }
+  }
+  return hr;
+}
+
+/// Confidence levels for each behavior based on evidence quality.
+Confidence getConfidenceForBehavior(String behaviorKey) {
+  switch (behaviorKey) {
+    case 'smoking':
+    case 'alcohol':
+    case 'activity':
+      return Confidence.high;
+    case 'sleep':
+    case 'workHours':
+      return Confidence.moderate;
+    case 'driving':
+      return Confidence.emerging;
+    default:
+      return Confidence.moderate;
+  }
+}
+
+/// Display names for behaviors.
+String getDisplayName(String behaviorKey) {
+  switch (behaviorKey) {
+    case 'smoking':
+      return 'Smoking';
+    case 'alcohol':
+      return 'Alcohol Consumption';
+    case 'sleep':
+      return 'Sleep';
+    case 'activity':
+      return 'Physical Activity';
+    case 'driving':
+      return 'Driving Exposure';
+    case 'workHours':
+      return 'Work Hours';
+    default:
+      return behaviorKey;
+  }
+}

lib/risk_engine/mortality_tables.dart

@@ -0,0 +1,131 @@
+import '../models/models.dart';
+
+/// Simplified mortality groups with approximate life expectancy at birth.
+/// Data approximated from WHO 2024 estimates.
+enum MortalityGroup {
+  groupA, // High LE countries (~83-85)
+  groupB, // Upper-middle LE (~79-81)
+  groupC, // Middle LE (~72-76)
+  groupD, // Lower LE (~65-70)
+}
+
+/// Maps countries to their mortality group.
+MortalityGroup getCountryGroup(String country) {
+  return _countryToGroup[country] ?? MortalityGroup.groupB;
+}
+
+/// Get baseline life expectancy at birth for a given country group and sex.
+double getLifeExpectancyAtBirth(MortalityGroup group, Sex sex) {
+  final base = _groupBaseLE[group]!;
+  // Women live ~4-5 years longer on average
+  return sex == Sex.female ? base + 4.5 : base;
+}
+
+/// Get remaining life expectancy at current age.
+/// Simplified model: as you age, remaining LE decreases but survivors
+/// tend to live longer than birth LE suggests.
+double getRemainingLifeExpectancy(int currentAge, Sex sex, String country) {
+  final group = getCountryGroup(country);
+  final leAtBirth = getLifeExpectancyAtBirth(group, sex);
+
+  if (currentAge >= leAtBirth) {
+    // Past average LE - use simplified survival model
+    // Each year survived past LE adds ~0.5-0.8 expected years
+    return 5.0 + (leAtBirth - currentAge) * 0.1;
+  }
+
+  // Simplified remaining LE calculation
+  // People who survive to age X have higher LE than birth cohort suggests
+  final survivorBonus = currentAge * 0.15; // ~0.15 years bonus per year survived
+  final rawRemaining = leAtBirth - currentAge;
+
+  return rawRemaining + survivorBonus.clamp(0, 5);
+}
+
+/// Base life expectancy by mortality group (male baseline).
+const _groupBaseLE = {
+  MortalityGroup.groupA: 81.0,
+  MortalityGroup.groupB: 77.0,
+  MortalityGroup.groupC: 72.0,
+  MortalityGroup.groupD: 65.0,
+};
+
+/// Country to mortality group mapping.
+const _countryToGroup = {
+  // Group A - High LE (83-85)
+  'Japan': MortalityGroup.groupA,
+  'Switzerland': MortalityGroup.groupA,
+  'Singapore': MortalityGroup.groupA,
+  'Spain': MortalityGroup.groupA,
+  'Italy': MortalityGroup.groupA,
+  'Australia': MortalityGroup.groupA,
+  'Iceland': MortalityGroup.groupA,
+  'Israel': MortalityGroup.groupA,
+  'Sweden': MortalityGroup.groupA,
+  'France': MortalityGroup.groupA,
+  'South Korea': MortalityGroup.groupA,
+  'Norway': MortalityGroup.groupA,
+
+  // Group B - Upper-middle LE (79-81)
+  'United States': MortalityGroup.groupB,
+  'United Kingdom': MortalityGroup.groupB,
+  'Germany': MortalityGroup.groupB,
+  'Canada': MortalityGroup.groupB,
+  'Netherlands': MortalityGroup.groupB,
+  'Belgium': MortalityGroup.groupB,
+  'Austria': MortalityGroup.groupB,
+  'Finland': MortalityGroup.groupB,
+  'Ireland': MortalityGroup.groupB,
+  'New Zealand': MortalityGroup.groupB,
+  'Denmark': MortalityGroup.groupB,
+  'Portugal': MortalityGroup.groupB,
+  'Czech Republic': MortalityGroup.groupB,
+  'Poland': MortalityGroup.groupB,
+  'Chile': MortalityGroup.groupB,
+  'Costa Rica': MortalityGroup.groupB,
+  'Cuba': MortalityGroup.groupB,
+  'United Arab Emirates': MortalityGroup.groupB,
+  'Qatar': MortalityGroup.groupB,
+  'Taiwan': MortalityGroup.groupB,
+
+  // Group C - Middle LE (72-76)
+  'China': MortalityGroup.groupC,
+  'Brazil': MortalityGroup.groupC,
+  'Mexico': MortalityGroup.groupC,
+  'Russia': MortalityGroup.groupC,
+  'Turkey': MortalityGroup.groupC,
+  'Argentina': MortalityGroup.groupC,
+  'Colombia': MortalityGroup.groupC,
+  'Thailand': MortalityGroup.groupC,
+  'Vietnam': MortalityGroup.groupC,
+  'Malaysia': MortalityGroup.groupC,
+  'Iran': MortalityGroup.groupC,
+  'Saudi Arabia': MortalityGroup.groupC,
+  'Egypt': MortalityGroup.groupC,
+  'Ukraine': MortalityGroup.groupC,
+  'Romania': MortalityGroup.groupC,
+  'Hungary': MortalityGroup.groupC,
+  'Peru': MortalityGroup.groupC,
+  'Philippines': MortalityGroup.groupC,
+
+  // Group D - Lower LE (65-70)
+  'India': MortalityGroup.groupD,
+  'Indonesia': MortalityGroup.groupD,
+  'South Africa': MortalityGroup.groupD,
+  'Pakistan': MortalityGroup.groupD,
+  'Bangladesh': MortalityGroup.groupD,
+  'Nigeria': MortalityGroup.groupD,
+  'Kenya': MortalityGroup.groupD,
+  'Ghana': MortalityGroup.groupD,
+  'Ethiopia': MortalityGroup.groupD,
+  'Myanmar': MortalityGroup.groupD,
+  'Nepal': MortalityGroup.groupD,
+  'Cambodia': MortalityGroup.groupD,
+};
+
+/// Get list of all supported countries, sorted alphabetically.
+List<String> getSupportedCountries() {
+  final countries = _countryToGroup.keys.toList();
+  countries.sort();
+  return countries;
+}

lib/risk_engine/risk_engine.dart

@@ -0,0 +1,3 @@
+export 'hazard_ratios.dart';
+export 'mortality_tables.dart';
+export 'calculator.dart';

lib/screens/baseline_screen.dart

@@ -0,0 +1,419 @@
+import 'package:flutter/material.dart';
+import '../models/models.dart';
+import '../risk_engine/mortality_tables.dart';
+import '../storage/local_storage.dart';
+import '../theme.dart';
+import 'behavioral_screen.dart';
+
+class BaselineScreen extends StatefulWidget {
+  const BaselineScreen({super.key});
+
+  @override
+  State<BaselineScreen> createState() => _BaselineScreenState();
+}
+
+class _BaselineScreenState extends State<BaselineScreen> {
+  int _age = 35;
+  Sex _sex = Sex.male;
+  String _country = 'United States';
+  double _heightCm = 170;
+  double _weightKg = 70;
+  final Set<Diagnosis> _diagnoses = {};
+
+  late List<String> _countries;
+
+  @override
+  void initState() {
+    super.initState();
+    _countries = getSupportedCountries();
+    _loadExistingProfile();
+  }
+
+  Future<void> _loadExistingProfile() async {
+    final profile = await LocalStorage.getProfile();
+    if (profile != null) {
+      setState(() {
+        _age = profile.age;
+        _sex = profile.sex;
+        _country = profile.country;
+        _heightCm = profile.heightCm;
+        _weightKg = profile.weightKg;
+        _diagnoses.clear();
+        _diagnoses.addAll(profile.diagnoses);
+      });
+    }
+  }
+
+  double get _bmi => _weightKg / ((_heightCm / 100) * (_heightCm / 100));
+
+  String get _bmiCategory {
+    if (_bmi < 18.5) return 'Underweight';
+    if (_bmi < 25) return 'Normal';
+    if (_bmi < 30) return 'Overweight';
+    if (_bmi < 35) return 'Obese I';
+    if (_bmi < 40) return 'Obese II';
+    return 'Obese III';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Baseline'),
+        leading: IconButton(
+          icon: const Icon(Icons.arrow_back),
+          onPressed: () => Navigator.pop(context),
+        ),
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(24),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Demographics',
+              style: Theme.of(context).textTheme.headlineSmall,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'This information establishes your baseline life expectancy.',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+            const SizedBox(height: 24),
+
+            // Age
+            _buildSectionLabel('Age'),
+            const SizedBox(height: 8),
+            _buildAgeSelector(),
+            const SizedBox(height: 24),
+
+            // Sex
+            _buildSectionLabel('Biological Sex'),
+            const SizedBox(height: 8),
+            _buildSexSelector(),
+            const SizedBox(height: 24),
+
+            // Country
+            _buildSectionLabel('Country'),
+            const SizedBox(height: 8),
+            _buildCountryDropdown(),
+            const SizedBox(height: 24),
+
+            // Height
+            _buildSectionLabel('Height'),
+            const SizedBox(height: 8),
+            _buildHeightSlider(),
+            const SizedBox(height: 24),
+
+            // Weight
+            _buildSectionLabel('Weight'),
+            const SizedBox(height: 8),
+            _buildWeightSlider(),
+            const SizedBox(height: 16),
+
+            // BMI display
+            _buildBmiDisplay(),
+            const SizedBox(height: 32),
+
+            // Existing conditions
+            Text(
+              'Existing Conditions',
+              style: Theme.of(context).textTheme.headlineSmall,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Select any diagnosed conditions. These affect baseline calculations but are not modifiable factors.',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+            const SizedBox(height: 16),
+            _buildDiagnosisCheckboxes(),
+            const SizedBox(height: 32),
+
+            // Continue button
+            SizedBox(
+              width: double.infinity,
+              child: ElevatedButton(
+                onPressed: _continue,
+                child: const Text('Continue'),
+              ),
+            ),
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSectionLabel(String label) {
+    return Text(
+      label,
+      style: Theme.of(context).textTheme.labelLarge,
+    );
+  }
+
+  Widget _buildAgeSelector() {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      decoration: BoxDecoration(
+        color: AppColors.surfaceVariant,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Row(
+        children: [
+          IconButton(
+            icon: const Icon(Icons.remove),
+            onPressed: _age > 18 ? () => setState(() => _age--) : null,
+          ),
+          Expanded(
+            child: Text(
+              '$_age years',
+              textAlign: TextAlign.center,
+              style: Theme.of(context).textTheme.headlineMedium,
+            ),
+          ),
+          IconButton(
+            icon: const Icon(Icons.add),
+            onPressed: _age < 100 ? () => setState(() => _age++) : null,
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildSexSelector() {
+    return Row(
+      children: [
+        Expanded(
+          child: _buildToggleButton(
+            'Male',
+            _sex == Sex.male,
+            () => setState(() => _sex = Sex.male),
+          ),
+        ),
+        const SizedBox(width: 12),
+        Expanded(
+          child: _buildToggleButton(
+            'Female',
+            _sex == Sex.female,
+            () => setState(() => _sex = Sex.female),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildToggleButton(String label, bool selected, VoidCallback onTap) {
+    return GestureDetector(
+      onTap: onTap,
+      child: Container(
+        padding: const EdgeInsets.symmetric(vertical: 14),
+        decoration: BoxDecoration(
+          color: selected ? AppColors.primary : AppColors.surfaceVariant,
+          borderRadius: BorderRadius.circular(12),
+        ),
+        child: Text(
+          label,
+          textAlign: TextAlign.center,
+          style: TextStyle(
+            fontSize: 16,
+            fontWeight: FontWeight.w600,
+            color: selected ? Colors.white : AppColors.textSecondary,
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildCountryDropdown() {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16),
+      decoration: BoxDecoration(
+        color: AppColors.surfaceVariant,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: DropdownButtonHideUnderline(
+        child: DropdownButton<String>(
+          value: _country,
+          isExpanded: true,
+          icon: const Icon(Icons.keyboard_arrow_down),
+          items: _countries.map((country) {
+            return DropdownMenuItem(
+              value: country,
+              child: Text(country),
+            );
+          }).toList(),
+          onChanged: (value) {
+            if (value != null) setState(() => _country = value);
+          },
+        ),
+      ),
+    );
+  }
+
+  Widget _buildHeightSlider() {
+    return Column(
+      children: [
+        Row(
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          children: [
+            Text(
+              '${_heightCm.round()} cm',
+              style: Theme.of(context).textTheme.headlineMedium,
+            ),
+            Text(
+              _cmToFeetInches(_heightCm),
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+          ],
+        ),
+        Slider(
+          value: _heightCm,
+          min: 120,
+          max: 220,
+          divisions: 100,
+          onChanged: (value) => setState(() => _heightCm = value),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildWeightSlider() {
+    return Column(
+      children: [
+        Row(
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          children: [
+            Text(
+              '${_weightKg.round()} kg',
+              style: Theme.of(context).textTheme.headlineMedium,
+            ),
+            Text(
+              '${(_weightKg * 2.205).round()} lbs',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+          ],
+        ),
+        Slider(
+          value: _weightKg,
+          min: 30,
+          max: 200,
+          divisions: 170,
+          onChanged: (value) => setState(() => _weightKg = value),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildBmiDisplay() {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: AppColors.surfaceVariant,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [
+          Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                'BMI',
+                style: Theme.of(context).textTheme.bodyMedium,
+              ),
+              Text(
+                _bmi.toStringAsFixed(1),
+                style: Theme.of(context).textTheme.headlineMedium,
+              ),
+            ],
+          ),
+          Container(
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+            decoration: BoxDecoration(
+              color: _getBmiColor(),
+              borderRadius: BorderRadius.circular(8),
+            ),
+            child: Text(
+              _bmiCategory,
+              style: const TextStyle(
+                color: Colors.white,
+                fontWeight: FontWeight.w600,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Color _getBmiColor() {
+    if (_bmi < 18.5 || _bmi >= 30) return AppColors.warning;
+    if (_bmi >= 25) return AppColors.primary;
+    return AppColors.success;
+  }
+
+  Widget _buildDiagnosisCheckboxes() {
+    return Column(
+      children: Diagnosis.values.map((diagnosis) {
+        return CheckboxListTile(
+          value: _diagnoses.contains(diagnosis),
+          onChanged: (checked) {
+            setState(() {
+              if (checked == true) {
+                _diagnoses.add(diagnosis);
+              } else {
+                _diagnoses.remove(diagnosis);
+              }
+            });
+          },
+          title: Text(_getDiagnosisLabel(diagnosis)),
+          controlAffinity: ListTileControlAffinity.leading,
+          contentPadding: EdgeInsets.zero,
+        );
+      }).toList(),
+    );
+  }
+
+  String _getDiagnosisLabel(Diagnosis diagnosis) {
+    switch (diagnosis) {
+      case Diagnosis.cardiovascular:
+        return 'Cardiovascular disease';
+      case Diagnosis.diabetes:
+        return 'Diabetes';
+      case Diagnosis.cancer:
+        return 'Cancer (active)';
+      case Diagnosis.copd:
+        return 'COPD';
+      case Diagnosis.hypertension:
+        return 'Hypertension';
+    }
+  }
+
+  String _cmToFeetInches(double cm) {
+    final totalInches = cm / 2.54;
+    final feet = (totalInches / 12).floor();
+    final inches = (totalInches % 12).round();
+    return "$feet'$inches\"";
+  }
+
+  void _continue() async {
+    final profile = UserProfile(
+      age: _age,
+      sex: _sex,
+      country: _country,
+      heightCm: _heightCm,
+      weightKg: _weightKg,
+      diagnoses: _diagnoses,
+    );
+
+    await LocalStorage.saveProfile(profile);
+
+    if (mounted) {
+      Navigator.of(context).push(
+        MaterialPageRoute(
+          builder: (_) => BehavioralScreen(profile: profile),
+        ),
+      );
+    }
+  }
+}

lib/screens/behavioral_screen.dart

@@ -0,0 +1,357 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import '../models/models.dart';
+import '../storage/local_storage.dart';
+import '../theme.dart';
+import 'results_screen.dart';
+
+class BehavioralScreen extends StatefulWidget {
+  final UserProfile profile;
+
+  const BehavioralScreen({super.key, required this.profile});
+
+  @override
+  State<BehavioralScreen> createState() => _BehavioralScreenState();
+}
+
+class _BehavioralScreenState extends State<BehavioralScreen> {
+  SmokingStatus _smoking = SmokingStatus.never;
+  int _cigarettesPerDay = 0;
+  AlcoholLevel _alcohol = AlcoholLevel.none;
+  double _sleepHours = 7.5;
+  bool _sleepConsistent = true;
+  ActivityLevel _activity = ActivityLevel.moderate;
+  DrivingExposure _driving = DrivingExposure.low;
+  WorkHoursLevel _workHours = WorkHoursLevel.normal;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadExistingBehaviors();
+  }
+
+  Future<void> _loadExistingBehaviors() async {
+    final behaviors = await LocalStorage.getBehaviors();
+    if (behaviors != null) {
+      setState(() {
+        _smoking = behaviors.smoking;
+        _cigarettesPerDay = behaviors.cigarettesPerDay;
+        _alcohol = behaviors.alcohol;
+        _sleepHours = behaviors.sleepHours;
+        _sleepConsistent = behaviors.sleepConsistent;
+        _activity = behaviors.activity;
+        _driving = behaviors.driving;
+        _workHours = behaviors.workHours;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Behaviors'),
+        leading: IconButton(
+          icon: const Icon(Icons.arrow_back),
+          onPressed: () => Navigator.pop(context),
+        ),
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(24),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Modifiable Factors',
+              style: Theme.of(context).textTheme.headlineSmall,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'These behaviors can be changed. We\'ll identify which has the largest impact.',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+            const SizedBox(height: 32),
+
+            // Smoking
+            _buildSectionLabel('Smoking'),
+            const SizedBox(height: 12),
+            _buildSmokingSelector(),
+            if (_smoking == SmokingStatus.current) ...[
+              const SizedBox(height: 16),
+              _buildCigarettesSlider(),
+            ],
+            const SizedBox(height: 28),
+
+            // Alcohol
+            _buildSectionLabel('Alcohol'),
+            const SizedBox(height: 12),
+            _buildAlcoholSelector(),
+            const SizedBox(height: 28),
+
+            // Sleep
+            _buildSectionLabel('Sleep'),
+            const SizedBox(height: 12),
+            _buildSleepSlider(),
+            const SizedBox(height: 12),
+            _buildSleepConsistentToggle(),
+            const SizedBox(height: 28),
+
+            // Physical Activity
+            _buildSectionLabel('Physical Activity'),
+            const SizedBox(height: 12),
+            _buildActivitySelector(),
+            const SizedBox(height: 28),
+
+            // Driving Exposure
+            _buildSectionLabel('Driving Exposure'),
+            const SizedBox(height: 12),
+            _buildDrivingSelector(),
+            const SizedBox(height: 28),
+
+            // Work Hours
+            _buildSectionLabel('Work Hours'),
+            const SizedBox(height: 12),
+            _buildWorkHoursSelector(),
+            const SizedBox(height: 40),
+
+            // Calculate button
+            SizedBox(
+              width: double.infinity,
+              child: ElevatedButton(
+                onPressed: _calculate,
+                child: const Text('Calculate'),
+              ),
+            ),
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSectionLabel(String label) {
+    return Text(
+      label,
+      style: Theme.of(context).textTheme.labelLarge,
+    );
+  }
+
+  Widget _buildSmokingSelector() {
+    return _buildSegmentedControl<SmokingStatus>(
+      value: _smoking,
+      options: [
+        (SmokingStatus.never, 'Never'),
+        (SmokingStatus.former, 'Former'),
+        (SmokingStatus.current, 'Current'),
+      ],
+      onChanged: (value) => setState(() => _smoking = value),
+    );
+  }
+
+  Widget _buildCigarettesSlider() {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(
+          'Cigarettes per day',
+          style: Theme.of(context).textTheme.bodyMedium,
+        ),
+        const SizedBox(height: 8),
+        Row(
+          children: [
+            Expanded(
+              child: Slider(
+                value: _cigarettesPerDay.toDouble(),
+                min: 1,
+                max: 40,
+                divisions: 39,
+                onChanged: (value) {
+                  // Haptic feedback at 20 (one pack)
+                  if (value.round() == 20 && _cigarettesPerDay != 20) {
+                    HapticFeedback.mediumImpact();
+                  }
+                  setState(() => _cigarettesPerDay = value.round());
+                },
+              ),
+            ),
+            SizedBox(
+              width: 50,
+              child: Text(
+                '$_cigarettesPerDay',
+                style: Theme.of(context).textTheme.headlineMedium,
+                textAlign: TextAlign.center,
+              ),
+            ),
+          ],
+        ),
+        Text(
+          _cigarettesPerDay <= 20
+              ? '${(_cigarettesPerDay / 20).toStringAsFixed(1)} pack/day'
+              : '${(_cigarettesPerDay / 20).toStringAsFixed(1)} packs/day',
+          style: Theme.of(context).textTheme.bodySmall,
+        ),
+      ],
+    );
+  }
+
+  Widget _buildAlcoholSelector() {
+    return _buildSegmentedControl<AlcoholLevel>(
+      value: _alcohol,
+      options: [
+        (AlcoholLevel.none, 'None'),
+        (AlcoholLevel.light, '1-7/wk'),
+        (AlcoholLevel.moderate, '8-14'),
+        (AlcoholLevel.heavy, '15-21'),
+        (AlcoholLevel.veryHeavy, '21+'),
+      ],
+      onChanged: (value) => setState(() => _alcohol = value),
+    );
+  }
+
+  Widget _buildSleepSlider() {
+    return Column(
+      children: [
+        Row(
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          children: [
+            Text(
+              'Average hours per night',
+              style: Theme.of(context).textTheme.bodyMedium,
+            ),
+            Text(
+              _sleepHours.toStringAsFixed(1),
+              style: Theme.of(context).textTheme.headlineMedium,
+            ),
+          ],
+        ),
+        Slider(
+          value: _sleepHours,
+          min: 4,
+          max: 12,
+          divisions: 16,
+          onChanged: (value) => setState(() => _sleepHours = value),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildSleepConsistentToggle() {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        Text(
+          'Consistent schedule',
+          style: Theme.of(context).textTheme.bodyLarge,
+        ),
+        Switch(
+          value: _sleepConsistent,
+          onChanged: (value) => setState(() => _sleepConsistent = value),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildActivitySelector() {
+    return _buildSegmentedControl<ActivityLevel>(
+      value: _activity,
+      options: [
+        (ActivityLevel.sedentary, 'Sedentary'),
+        (ActivityLevel.light, 'Light'),
+        (ActivityLevel.moderate, 'Moderate'),
+        (ActivityLevel.high, 'High'),
+      ],
+      onChanged: (value) => setState(() => _activity = value),
+    );
+  }
+
+  Widget _buildDrivingSelector() {
+    return _buildSegmentedControl<DrivingExposure>(
+      value: _driving,
+      options: [
+        (DrivingExposure.low, '<50 mi/wk'),
+        (DrivingExposure.moderate, '50-150'),
+        (DrivingExposure.high, '150-300'),
+        (DrivingExposure.veryHigh, '300+'),
+      ],
+      onChanged: (value) => setState(() => _driving = value),
+    );
+  }
+
+  Widget _buildWorkHoursSelector() {
+    return _buildSegmentedControl<WorkHoursLevel>(
+      value: _workHours,
+      options: [
+        (WorkHoursLevel.normal, '<40'),
+        (WorkHoursLevel.elevated, '40-55'),
+        (WorkHoursLevel.high, '55-70'),
+        (WorkHoursLevel.extreme, '70+'),
+      ],
+      onChanged: (value) => setState(() => _workHours = value),
+    );
+  }
+
+  Widget _buildSegmentedControl<T>({
+    required T value,
+    required List<(T, String)> options,
+    required ValueChanged<T> onChanged,
+  }) {
+    return Container(
+      decoration: BoxDecoration(
+        color: AppColors.surfaceVariant,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Row(
+        children: options.map((option) {
+          final isSelected = value == option.$1;
+          return Expanded(
+            child: GestureDetector(
+              onTap: () => onChanged(option.$1),
+              child: Container(
+                padding: const EdgeInsets.symmetric(vertical: 12),
+                decoration: BoxDecoration(
+                  color: isSelected ? AppColors.primary : Colors.transparent,
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Text(
+                  option.$2,
+                  textAlign: TextAlign.center,
+                  style: TextStyle(
+                    fontSize: 13,
+                    fontWeight: FontWeight.w600,
+                    color: isSelected ? Colors.white : AppColors.textSecondary,
+                  ),
+                ),
+              ),
+            ),
+          );
+        }).toList(),
+      ),
+    );
+  }
+
+  void _calculate() async {
+    final behaviors = BehavioralInputs(
+      smoking: _smoking,
+      cigarettesPerDay: _cigarettesPerDay,
+      alcohol: _alcohol,
+      sleepHours: _sleepHours,
+      sleepConsistent: _sleepConsistent,
+      activity: _activity,
+      driving: _driving,
+      workHours: _workHours,
+    );
+
+    await LocalStorage.saveBehaviors(behaviors);
+
+    if (mounted) {
+      Navigator.of(context).push(
+        MaterialPageRoute(
+          builder: (_) => ResultsScreen(
+            profile: widget.profile,
+            behaviors: behaviors,
+          ),
+        ),
+      );
+    }
+  }
+}

lib/screens/results_screen.dart

@@ -0,0 +1,394 @@
+import 'package:flutter/material.dart';
+import '../models/models.dart';
+import '../risk_engine/calculator.dart';
+import '../storage/local_storage.dart';
+import '../theme.dart';
+import 'welcome_screen.dart';
+import 'baseline_screen.dart';
+
+class ResultsScreen extends StatefulWidget {
+  final UserProfile profile;
+  final BehavioralInputs behaviors;
+
+  const ResultsScreen({
+    super.key,
+    required this.profile,
+    required this.behaviors,
+  });
+
+  @override
+  State<ResultsScreen> createState() => _ResultsScreenState();
+}
+
+class _ResultsScreenState extends State<ResultsScreen> {
+  late CalculationResult _result;
+
+  @override
+  void initState() {
+    super.initState();
+    _result = calculateRankedFactors(widget.profile, widget.behaviors);
+    _saveResult();
+  }
+
+  Future<void> _saveResult() async {
+    await LocalStorage.saveResult(_result);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final dominant = _result.dominantFactor;
+    final secondary = _result.secondaryFactor;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Results'),
+        automaticallyImplyLeading: false,
+      ),
+      body: SafeArea(
+        child: SingleChildScrollView(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              if (dominant != null) ...[
+                // Dominant challenge card
+                _buildDominantCard(dominant),
+                const SizedBox(height: 24),
+
+                // Explanation
+                Text(
+                  'Addressing this exposure would likely produce the largest increase in expected lifespan among available changes.',
+                  style: Theme.of(context).textTheme.bodyMedium,
+                ),
+                const SizedBox(height: 32),
+
+                // Secondary factor
+                if (secondary != null) ...[
+                  Text(
+                    'Secondary Factor',
+                    style: Theme.of(context).textTheme.headlineSmall,
+                  ),
+                  const SizedBox(height: 12),
+                  _buildSecondaryCard(secondary),
+                  const SizedBox(height: 32),
+                ],
+
+                // All factors
+                if (_result.rankedFactors.length > 2) ...[
+                  Text(
+                    'All Factors',
+                    style: Theme.of(context).textTheme.headlineSmall,
+                  ),
+                  const SizedBox(height: 12),
+                  ..._result.rankedFactors.skip(2).map((factor) {
+                    return Padding(
+                      padding: const EdgeInsets.only(bottom: 8),
+                      child: _buildFactorRow(factor),
+                    );
+                  }),
+                  const SizedBox(height: 24),
+                ],
+              ] else ...[
+                // No factors to improve
+                _buildOptimalCard(),
+                const SizedBox(height: 24),
+              ],
+
+              // Model version
+              Center(
+                child: Text(
+                  'Model v${_result.modelVersion}',
+                  style: Theme.of(context).textTheme.bodySmall,
+                ),
+              ),
+              const SizedBox(height: 32),
+
+              // Action buttons
+              SizedBox(
+                width: double.infinity,
+                child: ElevatedButton(
+                  onPressed: _recalculate,
+                  child: const Text('Recalculate'),
+                ),
+              ),
+              const SizedBox(height: 12),
+              SizedBox(
+                width: double.infinity,
+                child: OutlinedButton(
+                  onPressed: _showDeleteConfirmation,
+                  style: OutlinedButton.styleFrom(
+                    foregroundColor: AppColors.error,
+                    side: const BorderSide(color: AppColors.error),
+                  ),
+                  child: const Text('Delete All Data'),
+                ),
+              ),
+              const SizedBox(height: 16),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildDominantCard(RankedFactor factor) {
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(24),
+      decoration: BoxDecoration(
+        gradient: const LinearGradient(
+          colors: [AppColors.primary, AppColors.primaryDark],
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+        ),
+        borderRadius: BorderRadius.circular(20),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          const Text(
+            'DOMINANT CHALLENGE',
+            style: TextStyle(
+              fontSize: 12,
+              fontWeight: FontWeight.w700,
+              color: Colors.white70,
+              letterSpacing: 1.2,
+            ),
+          ),
+          const SizedBox(height: 12),
+          Text(
+            factor.displayName,
+            style: const TextStyle(
+              fontSize: 28,
+              fontWeight: FontWeight.w700,
+              color: Colors.white,
+              letterSpacing: -0.5,
+            ),
+          ),
+          const SizedBox(height: 20),
+          Row(
+            children: [
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    const Text(
+                      'ESTIMATED GAIN',
+                      style: TextStyle(
+                        fontSize: 11,
+                        fontWeight: FontWeight.w600,
+                        color: Colors.white60,
+                        letterSpacing: 0.8,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      '${factor.delta.rangeDisplay} months',
+                      style: const TextStyle(
+                        fontSize: 24,
+                        fontWeight: FontWeight.w700,
+                        color: Colors.white,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              Container(
+                padding:
+                    const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+                decoration: BoxDecoration(
+                  color: Colors.white.withAlpha(51),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Text(
+                  _getConfidenceLabel(factor.delta.confidence),
+                  style: const TextStyle(
+                    fontSize: 13,
+                    fontWeight: FontWeight.w600,
+                    color: Colors.white,
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildSecondaryCard(RankedFactor factor) {
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(20),
+      decoration: BoxDecoration(
+        color: AppColors.surface,
+        borderRadius: BorderRadius.circular(16),
+        border: Border.all(color: AppColors.divider),
+      ),
+      child: Row(
+        children: [
+          Expanded(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  factor.displayName,
+                  style: Theme.of(context).textTheme.headlineSmall,
+                ),
+                const SizedBox(height: 4),
+                Text(
+                  '${factor.delta.rangeDisplay} months',
+                  style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                        color: AppColors.primary,
+                        fontWeight: FontWeight.w600,
+                      ),
+                ),
+              ],
+            ),
+          ),
+          _buildConfidenceBadge(factor.delta.confidence),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildFactorRow(RankedFactor factor) {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+      decoration: BoxDecoration(
+        color: AppColors.surfaceVariant,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [
+          Text(
+            factor.displayName,
+            style: Theme.of(context).textTheme.bodyLarge,
+          ),
+          Text(
+            '${factor.delta.rangeDisplay} mo',
+            style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                  color: AppColors.primary,
+                  fontWeight: FontWeight.w600,
+                ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildOptimalCard() {
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(24),
+      decoration: BoxDecoration(
+        color: AppColors.success.withAlpha(26),
+        borderRadius: BorderRadius.circular(20),
+        border: Border.all(color: AppColors.success.withAlpha(77)),
+      ),
+      child: Column(
+        children: [
+          const Icon(
+            Icons.check_circle_outline,
+            size: 48,
+            color: AppColors.success,
+          ),
+          const SizedBox(height: 16),
+          Text(
+            'No significant factors identified',
+            style: Theme.of(context).textTheme.headlineSmall?.copyWith(
+                  color: AppColors.success,
+                ),
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'Your current behaviors are near optimal based on our model.',
+            style: Theme.of(context).textTheme.bodyMedium,
+            textAlign: TextAlign.center,
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildConfidenceBadge(Confidence confidence) {
+    Color color;
+    switch (confidence) {
+      case Confidence.high:
+        color = AppColors.success;
+        break;
+      case Confidence.moderate:
+        color = AppColors.warning;
+        break;
+      case Confidence.emerging:
+        color = AppColors.textTertiary;
+        break;
+    }
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
+      decoration: BoxDecoration(
+        color: color.withAlpha(26),
+        borderRadius: BorderRadius.circular(6),
+      ),
+      child: Text(
+        _getConfidenceLabel(confidence),
+        style: TextStyle(
+          fontSize: 12,
+          fontWeight: FontWeight.w600,
+          color: color,
+        ),
+      ),
+    );
+  }
+
+  String _getConfidenceLabel(Confidence confidence) {
+    switch (confidence) {
+      case Confidence.high:
+        return 'High';
+      case Confidence.moderate:
+        return 'Moderate';
+      case Confidence.emerging:
+        return 'Emerging';
+    }
+  }
+
+  void _recalculate() {
+    Navigator.of(context).pushAndRemoveUntil(
+      MaterialPageRoute(builder: (_) => const BaselineScreen()),
+      (route) => false,
+    );
+  }
+
+  void _showDeleteConfirmation() {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Delete All Data'),
+        content: const Text(
+          'This will permanently delete all your data from this device. This action cannot be undone.',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () async {
+              final navigator = Navigator.of(context);
+              await LocalStorage.deleteAllData();
+              navigator.pushAndRemoveUntil(
+                MaterialPageRoute(builder: (_) => const WelcomeScreen()),
+                (route) => false,
+              );
+            },
+            style: TextButton.styleFrom(foregroundColor: AppColors.error),
+            child: const Text('Delete'),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/screens/screens.dart

@@ -0,0 +1,4 @@
+export 'welcome_screen.dart';
+export 'baseline_screen.dart';
+export 'behavioral_screen.dart';
+export 'results_screen.dart';

lib/screens/welcome_screen.dart

@@ -0,0 +1,128 @@
+import 'package:flutter/material.dart';
+import '../theme.dart';
+import 'baseline_screen.dart';
+
+class WelcomeScreen extends StatelessWidget {
+  const WelcomeScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 32),
+          child: Column(
+            children: [
+              const Spacer(flex: 2),
+              // Icon or logo area
+              Container(
+                width: 80,
+                height: 80,
+                decoration: BoxDecoration(
+                  color: AppColors.surfaceVariant,
+                  borderRadius: BorderRadius.circular(20),
+                ),
+                child: const Icon(
+                  Icons.timeline,
+                  size: 40,
+                  color: AppColors.primary,
+                ),
+              ),
+              const SizedBox(height: 32),
+              // Title
+              Text(
+                'Add Months',
+                style: Theme.of(context).textTheme.headlineLarge,
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 16),
+              // Description
+              Text(
+                'Identify the single change most likely to extend your lifespan.',
+                style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      color: AppColors.textSecondary,
+                    ),
+                textAlign: TextAlign.center,
+              ),
+              const SizedBox(height: 48),
+              // Features list
+              _buildFeatureItem(
+                context,
+                Icons.shield_outlined,
+                'Private',
+                'All data stays on your device',
+              ),
+              const SizedBox(height: 16),
+              _buildFeatureItem(
+                context,
+                Icons.science_outlined,
+                'Evidence-based',
+                'Hazard ratios from meta-analyses',
+              ),
+              const SizedBox(height: 16),
+              _buildFeatureItem(
+                context,
+                Icons.trending_up_outlined,
+                'Actionable',
+                'Focus on what matters most',
+              ),
+              const Spacer(flex: 3),
+              // Start button
+              SizedBox(
+                width: double.infinity,
+                child: ElevatedButton(
+                  onPressed: () => _navigateToBaseline(context),
+                  child: const Text('Start'),
+                ),
+              ),
+              const SizedBox(height: 32),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildFeatureItem(
+    BuildContext context,
+    IconData icon,
+    String title,
+    String description,
+  ) {
+    return Row(
+      children: [
+        Container(
+          width: 44,
+          height: 44,
+          decoration: BoxDecoration(
+            color: AppColors.surfaceVariant,
+            borderRadius: BorderRadius.circular(12),
+          ),
+          child: Icon(icon, color: AppColors.primary, size: 22),
+        ),
+        const SizedBox(width: 16),
+        Expanded(
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                title,
+                style: Theme.of(context).textTheme.labelLarge,
+              ),
+              Text(
+                description,
+                style: Theme.of(context).textTheme.bodySmall,
+              ),
+            ],
+          ),
+        ),
+      ],
+    );
+  }
+
+  void _navigateToBaseline(BuildContext context) {
+    Navigator.of(context).push(
+      MaterialPageRoute(builder: (_) => const BaselineScreen()),
+    );
+  }
+}

lib/storage/local_storage.dart

@@ -0,0 +1,125 @@
+import 'dart:convert';
+import 'package:sqflite/sqflite.dart';
+import 'package:path/path.dart';
+import '../models/models.dart';
+
+class LocalStorage {
+  static const _dbName = 'add_months.db';
+  static const _tableName = 'user_data';
+  static const _version = 1;
+
+  static Database? _database;
+
+  static Future<Database> get database async {
+    if (_database != null) return _database!;
+    _database = await _initDatabase();
+    return _database!;
+  }
+
+  static Future<Database> _initDatabase() async {
+    final dbPath = await getDatabasesPath();
+    final path = join(dbPath, _dbName);
+
+    return await openDatabase(
+      path,
+      version: _version,
+      onCreate: (db, version) async {
+        await db.execute('''
+          CREATE TABLE $_tableName (
+            key TEXT PRIMARY KEY,
+            value TEXT NOT NULL,
+            updated_at INTEGER NOT NULL
+          )
+        ''');
+      },
+    );
+  }
+
+  // Generic key-value operations
+  static Future<void> _put(String key, Map<String, dynamic> value) async {
+    final db = await database;
+    await db.insert(
+      _tableName,
+      {
+        'key': key,
+        'value': jsonEncode(value),
+        'updated_at': DateTime.now().millisecondsSinceEpoch,
+      },
+      conflictAlgorithm: ConflictAlgorithm.replace,
+    );
+  }
+
+  static Future<Map<String, dynamic>?> _get(String key) async {
+    final db = await database;
+    final results = await db.query(
+      _tableName,
+      where: 'key = ?',
+      whereArgs: [key],
+    );
+
+    if (results.isEmpty) return null;
+    return jsonDecode(results.first['value'] as String) as Map<String, dynamic>;
+  }
+
+  // Profile operations
+  static Future<void> saveProfile(UserProfile profile) async {
+    await _put('profile', profile.toJson());
+  }
+
+  static Future<UserProfile?> getProfile() async {
+    final json = await _get('profile');
+    if (json == null) return null;
+    return UserProfile.fromJson(json);
+  }
+
+  // Behavioral inputs operations
+  static Future<void> saveBehaviors(BehavioralInputs behaviors) async {
+    await _put('behaviors', behaviors.toJson());
+  }
+
+  static Future<BehavioralInputs?> getBehaviors() async {
+    final json = await _get('behaviors');
+    if (json == null) return null;
+    return BehavioralInputs.fromJson(json);
+  }
+
+  // Result operations
+  static Future<void> saveResult(CalculationResult result) async {
+    await _put('lastResult', result.toJson());
+  }
+
+  static Future<CalculationResult?> getLastResult() async {
+    final json = await _get('lastResult');
+    if (json == null) return null;
+    return CalculationResult.fromJson(json);
+  }
+
+  // Check if user has completed setup
+  static Future<bool> hasCompletedSetup() async {
+    final profile = await getProfile();
+    final behaviors = await getBehaviors();
+    return profile != null && behaviors != null;
+  }
+
+  // Delete all data
+  static Future<void> deleteAllData() async {
+    final db = await database;
+    await db.delete(_tableName);
+  }
+
+  // Get last updated timestamp
+  static Future<DateTime?> getLastUpdated() async {
+    final db = await database;
+    final results = await db.query(
+      _tableName,
+      columns: ['updated_at'],
+      orderBy: 'updated_at DESC',
+      limit: 1,
+    );
+
+    if (results.isEmpty) return null;
+    return DateTime.fromMillisecondsSinceEpoch(
+      results.first['updated_at'] as int,
+    );
+  }
+}

lib/theme.dart

@@ -0,0 +1,153 @@
+import 'package:flutter/material.dart';
+
+/// Muted clinical color palette.
+class AppColors {
+  static const primary = Color(0xFF4A90A4); // Muted teal
+  static const primaryDark = Color(0xFF2D6073);
+  static const primaryLight = Color(0xFF7BB8CC);
+
+  static const surface = Color(0xFFF8FAFB);
+  static const surfaceVariant = Color(0xFFEEF2F4);
+  static const background = Color(0xFFFFFFFF);
+
+  static const textPrimary = Color(0xFF1A2B33);
+  static const textSecondary = Color(0xFF5A6B73);
+  static const textTertiary = Color(0xFF8A9BA3);
+
+  static const success = Color(0xFF4A9A7C);
+  static const warning = Color(0xFFB8934A);
+  static const error = Color(0xFFA45A5A);
+
+  static const divider = Color(0xFFDDE4E8);
+}
+
+/// App-wide theme.
+ThemeData buildAppTheme() {
+  return ThemeData(
+    useMaterial3: true,
+    colorScheme: ColorScheme.light(
+      primary: AppColors.primary,
+      onPrimary: Colors.white,
+      secondary: AppColors.primaryLight,
+      surface: AppColors.surface,
+      onSurface: AppColors.textPrimary,
+    ),
+    scaffoldBackgroundColor: AppColors.background,
+    appBarTheme: const AppBarTheme(
+      backgroundColor: AppColors.background,
+      foregroundColor: AppColors.textPrimary,
+      elevation: 0,
+      centerTitle: true,
+      titleTextStyle: TextStyle(
+        fontFamily: 'SF Pro Display',
+        fontSize: 17,
+        fontWeight: FontWeight.w600,
+        color: AppColors.textPrimary,
+        letterSpacing: -0.3,
+      ),
+    ),
+    textTheme: const TextTheme(
+      headlineLarge: TextStyle(
+        fontSize: 28,
+        fontWeight: FontWeight.w600,
+        color: AppColors.textPrimary,
+        letterSpacing: -0.5,
+        height: 1.2,
+      ),
+      headlineMedium: TextStyle(
+        fontSize: 22,
+        fontWeight: FontWeight.w600,
+        color: AppColors.textPrimary,
+        letterSpacing: -0.3,
+        height: 1.3,
+      ),
+      headlineSmall: TextStyle(
+        fontSize: 18,
+        fontWeight: FontWeight.w600,
+        color: AppColors.textPrimary,
+        letterSpacing: -0.2,
+      ),
+      bodyLarge: TextStyle(
+        fontSize: 16,
+        fontWeight: FontWeight.w400,
+        color: AppColors.textPrimary,
+        height: 1.5,
+      ),
+      bodyMedium: TextStyle(
+        fontSize: 14,
+        fontWeight: FontWeight.w400,
+        color: AppColors.textSecondary,
+        height: 1.5,
+      ),
+      bodySmall: TextStyle(
+        fontSize: 12,
+        fontWeight: FontWeight.w400,
+        color: AppColors.textTertiary,
+        height: 1.4,
+      ),
+      labelLarge: TextStyle(
+        fontSize: 16,
+        fontWeight: FontWeight.w600,
+        color: AppColors.textPrimary,
+        letterSpacing: 0.1,
+      ),
+    ),
+    elevatedButtonTheme: ElevatedButtonThemeData(
+      style: ElevatedButton.styleFrom(
+        backgroundColor: AppColors.primary,
+        foregroundColor: Colors.white,
+        elevation: 0,
+        padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 16),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(12),
+        ),
+        textStyle: const TextStyle(
+          fontSize: 16,
+          fontWeight: FontWeight.w600,
+          letterSpacing: 0.2,
+        ),
+      ),
+    ),
+    outlinedButtonTheme: OutlinedButtonThemeData(
+      style: OutlinedButton.styleFrom(
+        foregroundColor: AppColors.primary,
+        side: const BorderSide(color: AppColors.primary, width: 1.5),
+        padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 16),
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(12),
+        ),
+        textStyle: const TextStyle(
+          fontSize: 16,
+          fontWeight: FontWeight.w600,
+          letterSpacing: 0.2,
+        ),
+      ),
+    ),
+    inputDecorationTheme: InputDecorationTheme(
+      filled: true,
+      fillColor: AppColors.surfaceVariant,
+      border: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(12),
+        borderSide: BorderSide.none,
+      ),
+      focusedBorder: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(12),
+        borderSide: const BorderSide(color: AppColors.primary, width: 2),
+      ),
+      contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
+      labelStyle: const TextStyle(color: AppColors.textSecondary),
+    ),
+    dividerTheme: const DividerThemeData(
+      color: AppColors.divider,
+      thickness: 1,
+    ),
+    cardTheme: CardThemeData(
+      color: AppColors.surface,
+      elevation: 0,
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(16),
+        side: const BorderSide(color: AppColors.divider, width: 1),
+      ),
+    ),
+  );
+}

pubspec.yaml

@@ -0,0 +1,92 @@
+name: add_months
+description: "Identify the single change most likely to extend your lifespan."
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# In Android, build-name is used as versionName while build-number used as versionCode.
+# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
+# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
+# Read more about iOS versioning at
+# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
+# In Windows, build-name is used as the major, minor, and patch parts
+# of the product and file versions while build-number is used as the build suffix.
+version: 1.0.0+1
+
+environment:
+  sdk: ^3.10.4
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+  cupertino_icons: ^1.0.8
+  sqflite: ^2.3.0
+  path: ^1.8.3
+  flutter_secure_storage: ^9.0.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^6.0.0
+  flutter_launcher_icons: ^0.14.1
+
+flutter_launcher_icons:
+  android: true
+  ios: true
+  remove_alpha_ios: true
+  image_path: "assets/icon/app_icon.png"
+  adaptive_icon_background: "#FFFFFF"
+  adaptive_icon_foreground: "assets/icon/app_icon_foreground.png"
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/to/resolution-aware-images
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/to/asset-from-package
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/to/font-from-package

test/risk_engine/calculator_test.dart

@@ -0,0 +1,224 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:add_months/models/models.dart';
+import 'package:add_months/risk_engine/risk_engine.dart';
+
+void main() {
+  group('Hazard Ratios', () {
+    test('smoking current produces HR > 1.8', () {
+      expect(getSmokingHR(SmokingStatus.current, 10), greaterThanOrEqualTo(1.8));
+    });
+
+    test('smoking heavy (>20/day) produces highest HR', () {
+      final lightHR = getSmokingHR(SmokingStatus.current, 5);
+      final moderateHR = getSmokingHR(SmokingStatus.current, 15);
+      final heavyHR = getSmokingHR(SmokingStatus.current, 25);
+
+      expect(heavyHR, greaterThan(moderateHR));
+      expect(moderateHR, greaterThan(lightHR));
+      expect(heavyHR, equals(2.8));
+    });
+
+    test('never smoker has HR of 1.0', () {
+      expect(getSmokingHR(SmokingStatus.never, 0), equals(1.0));
+    });
+
+    test('sedentary activity has higher HR than active', () {
+      expect(
+        getActivityHR(ActivityLevel.sedentary),
+        greaterThan(getActivityHR(ActivityLevel.high)),
+      );
+    });
+
+    test('very heavy alcohol has highest HR', () {
+      expect(getAlcoholHR(AlcoholLevel.veryHeavy), equals(1.6));
+      expect(getAlcoholHR(AlcoholLevel.none), equals(1.0));
+    });
+
+    test('short sleep has higher HR than optimal', () {
+      expect(getSleepHR(5.0, true), greaterThan(getSleepHR(7.5, true)));
+    });
+
+    test('inconsistent sleep adds to HR', () {
+      expect(getSleepHR(7.0, false), greaterThan(getSleepHR(7.0, true)));
+    });
+  });
+
+  group('Mortality Tables', () {
+    test('Japan is in Group A', () {
+      expect(getCountryGroup('Japan'), equals(MortalityGroup.groupA));
+    });
+
+    test('United States is in Group B', () {
+      expect(getCountryGroup('United States'), equals(MortalityGroup.groupB));
+    });
+
+    test('female LE is higher than male', () {
+      final maleLE =
+          getLifeExpectancyAtBirth(MortalityGroup.groupB, Sex.male);
+      final femaleLE =
+          getLifeExpectancyAtBirth(MortalityGroup.groupB, Sex.female);
+
+      expect(femaleLE, greaterThan(maleLE));
+    });
+
+    test('remaining LE decreases with age', () {
+      final le30 = getRemainingLifeExpectancy(30, Sex.male, 'United States');
+      final le50 = getRemainingLifeExpectancy(50, Sex.male, 'United States');
+
+      expect(le30, greaterThan(le50));
+    });
+
+    test('getSupportedCountries returns sorted list', () {
+      final countries = getSupportedCountries();
+      expect(countries, isNotEmpty);
+      expect(countries.first, equals('Argentina'));
+      expect(countries, contains('United States'));
+    });
+  });
+
+  group('Calculator', () {
+    final healthyProfile = UserProfile(
+      age: 40,
+      sex: Sex.male,
+      country: 'United States',
+      heightCm: 175,
+      weightKg: 75,
+    );
+
+    final optimalInputs = BehavioralInputs.optimal;
+
+    final unhealthyInputs = BehavioralInputs(
+      smoking: SmokingStatus.current,
+      cigarettesPerDay: 20,
+      alcohol: AlcoholLevel.heavy,
+      sleepHours: 5.0,
+      sleepConsistent: false,
+      activity: ActivityLevel.sedentary,
+      driving: DrivingExposure.veryHigh,
+      workHours: WorkHoursLevel.extreme,
+    );
+
+    test('optimal inputs produce low combined HR', () {
+      final hr = computeCombinedHazard(optimalInputs, 22.0);
+      expect(hr, closeTo(1.0, 0.1));
+    });
+
+    test('unhealthy inputs produce high combined HR', () {
+      final hr = computeCombinedHazard(unhealthyInputs, 35.0);
+      expect(hr, greaterThan(3.0));
+    });
+
+    test('combined HR is capped at 4.0', () {
+      final hr = computeCombinedHazard(unhealthyInputs, 45.0);
+      expect(hr, lessThanOrEqualTo(4.0));
+    });
+
+    test('ranking puts smoking above driving for heavy smoker', () {
+      final smokerInputs = BehavioralInputs(
+        smoking: SmokingStatus.current,
+        cigarettesPerDay: 20,
+        alcohol: AlcoholLevel.none,
+        sleepHours: 7.5,
+        sleepConsistent: true,
+        activity: ActivityLevel.high,
+        driving: DrivingExposure.veryHigh,
+        workHours: WorkHoursLevel.normal,
+      );
+
+      final result = calculateRankedFactors(healthyProfile, smokerInputs);
+
+      expect(result.rankedFactors, isNotEmpty);
+      expect(result.dominantFactor?.behaviorKey, equals('smoking'));
+    });
+
+    test('optimal profile returns empty factors', () {
+      final result = calculateRankedFactors(healthyProfile, optimalInputs);
+      expect(result.rankedFactors, isEmpty);
+    });
+
+    test('result includes model version', () {
+      final result = calculateRankedFactors(healthyProfile, unhealthyInputs);
+      expect(result.modelVersion, equals('1.0'));
+    });
+
+    test('sedentary person sees activity as factor', () {
+      final sedentaryInputs = BehavioralInputs(
+        smoking: SmokingStatus.never,
+        cigarettesPerDay: 0,
+        alcohol: AlcoholLevel.none,
+        sleepHours: 7.5,
+        sleepConsistent: true,
+        activity: ActivityLevel.sedentary,
+        driving: DrivingExposure.low,
+        workHours: WorkHoursLevel.normal,
+      );
+
+      final result = calculateRankedFactors(healthyProfile, sedentaryInputs);
+
+      expect(result.rankedFactors, isNotEmpty);
+      expect(result.dominantFactor?.behaviorKey, equals('activity'));
+    });
+
+    test('delta ranges are reasonable', () {
+      final result = calculateRankedFactors(healthyProfile, unhealthyInputs);
+
+      for (final factor in result.rankedFactors) {
+        // Low should be less than or equal to high
+        expect(factor.delta.lowMonths, lessThanOrEqualTo(factor.delta.highMonths));
+        // Months should be reasonable (not hundreds of years)
+        expect(factor.delta.highMonths, lessThan(240)); // < 20 years
+      }
+    });
+  });
+
+  group('Existing Conditions', () {
+    test('cardiovascular disease increases diagnosis HR', () {
+      final hr = getDiagnosisHR({Diagnosis.cardiovascular});
+      expect(hr, equals(1.5));
+    });
+
+    test('multiple conditions compound', () {
+      final singleHR = getDiagnosisHR({Diagnosis.diabetes});
+      final multiHR = getDiagnosisHR({Diagnosis.diabetes, Diagnosis.hypertension});
+
+      expect(multiHR, greaterThan(singleHR));
+    });
+
+    test('conditions reduce effective baseline', () {
+      final healthyProfile = UserProfile(
+        age: 50,
+        sex: Sex.male,
+        country: 'United States',
+        heightCm: 175,
+        weightKg: 80,
+        diagnoses: {},
+      );
+
+      final unhealthyProfile = healthyProfile.copyWith(
+        diagnoses: {Diagnosis.cardiovascular, Diagnosis.diabetes},
+      );
+
+      final sedentaryInputs = BehavioralInputs(
+        smoking: SmokingStatus.never,
+        cigarettesPerDay: 0,
+        alcohol: AlcoholLevel.none,
+        sleepHours: 7.5,
+        sleepConsistent: true,
+        activity: ActivityLevel.sedentary,
+        driving: DrivingExposure.low,
+        workHours: WorkHoursLevel.normal,
+      );
+
+      final healthyResult = calculateRankedFactors(healthyProfile, sedentaryInputs);
+      final unhealthyResult = calculateRankedFactors(unhealthyProfile, sedentaryInputs);
+
+      // Unhealthy person has less to gain (lower baseline)
+      if (healthyResult.dominantFactor != null && unhealthyResult.dominantFactor != null) {
+        expect(
+          unhealthyResult.dominantFactor!.delta.highMonths,
+          lessThan(healthyResult.dominantFactor!.delta.highMonths),
+        );
+      }
+    });
+  });
+}

test/widget_test.dart

@@ -0,0 +1,7 @@
+// Widget tests require SQLite mocking which is complex.
+// Core logic is covered by risk_engine tests.
+// Integration testing should be done on device.
+
+void main() {
+  // Run: flutter test test/risk_engine/ for unit tests
+}

tool/generate_icon.dart

@@ -0,0 +1,198 @@
+import 'dart:io';
+import 'dart:typed_data';
+import 'dart:math';
+
+/// Generates a simple tree icon PNG
+void main() async {
+  const size = 1024;
+  final pixels = Uint8List(size * size * 4);
+
+  // Fill with white background
+  for (var i = 0; i < pixels.length; i += 4) {
+    pixels[i] = 255;     // R
+    pixels[i + 1] = 255; // G
+    pixels[i + 2] = 255; // B
+    pixels[i + 3] = 255; // A
+  }
+
+  // Tree colors (muted teal from our theme)
+  const treeR = 74;  // 0x4A
+  const treeG = 144; // 0x90
+  const treeB = 164; // 0xA4
+
+  // Trunk color (darker)
+  const trunkR = 90;
+  const trunkG = 70;
+  const trunkB = 55;
+
+  // Draw tree trunk (rectangle)
+  final trunkLeft = (size * 0.44).round();
+  final trunkRight = (size * 0.56).round();
+  final trunkTop = (size * 0.65).round();
+  final trunkBottom = (size * 0.85).round();
+
+  for (var y = trunkTop; y < trunkBottom; y++) {
+    for (var x = trunkLeft; x < trunkRight; x++) {
+      final i = (y * size + x) * 4;
+      pixels[i] = trunkR;
+      pixels[i + 1] = trunkG;
+      pixels[i + 2] = trunkB;
+      pixels[i + 3] = 255;
+    }
+  }
+
+  // Draw tree canopy (three triangles stacked)
+  void drawTriangle(int centerX, int topY, int height, int baseWidth) {
+    for (var y = topY; y < topY + height; y++) {
+      final progress = (y - topY) / height;
+      final halfWidth = (baseWidth * progress / 2).round();
+      for (var x = centerX - halfWidth; x <= centerX + halfWidth; x++) {
+        if (x >= 0 && x < size && y >= 0 && y < size) {
+          final i = (y * size + x) * 4;
+          pixels[i] = treeR;
+          pixels[i + 1] = treeG;
+          pixels[i + 2] = treeB;
+          pixels[i + 3] = 255;
+        }
+      }
+    }
+  }
+
+  final centerX = size ~/ 2;
+
+  // Top triangle (smallest)
+  drawTriangle(centerX, (size * 0.15).round(), (size * 0.20).round(), (size * 0.35).round());
+
+  // Middle triangle
+  drawTriangle(centerX, (size * 0.28).round(), (size * 0.22).round(), (size * 0.48).round());
+
+  // Bottom triangle (largest)
+  drawTriangle(centerX, (size * 0.42).round(), (size * 0.26).round(), (size * 0.58).round());
+
+  // Encode as PNG
+  final png = encodePng(size, size, pixels);
+
+  // Write to file
+  final file = File('assets/icon/app_icon.png');
+  await file.writeAsBytes(png);
+  print('Generated app_icon.png');
+
+  // Also create foreground version (same but smaller for adaptive icons)
+  final foregroundFile = File('assets/icon/app_icon_foreground.png');
+  await foregroundFile.writeAsBytes(png);
+  print('Generated app_icon_foreground.png');
+}
+
+/// Simple PNG encoder (no compression for simplicity)
+Uint8List encodePng(int width, int height, Uint8List rgba) {
+  final output = BytesBuilder();
+
+  // PNG signature
+  output.add([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);
+
+  // IHDR chunk
+  final ihdr = BytesBuilder();
+  ihdr.add(_int32be(width));
+  ihdr.add(_int32be(height));
+  ihdr.addByte(8);  // bit depth
+  ihdr.addByte(6);  // color type (RGBA)
+  ihdr.addByte(0);  // compression
+  ihdr.addByte(0);  // filter
+  ihdr.addByte(0);  // interlace
+  _writeChunk(output, 'IHDR', ihdr.toBytes());
+
+  // IDAT chunk (image data with zlib compression)
+  // For simplicity, we'll use store (no compression)
+  final rawData = BytesBuilder();
+  for (var y = 0; y < height; y++) {
+    rawData.addByte(0); // filter type: None
+    for (var x = 0; x < width; x++) {
+      final i = (y * width + x) * 4;
+      rawData.addByte(rgba[i]);     // R
+      rawData.addByte(rgba[i + 1]); // G
+      rawData.addByte(rgba[i + 2]); // B
+      rawData.addByte(rgba[i + 3]); // A
+    }
+  }
+
+  final compressed = _deflateStore(rawData.toBytes());
+  _writeChunk(output, 'IDAT', compressed);
+
+  // IEND chunk
+  _writeChunk(output, 'IEND', Uint8List(0));
+
+  return output.toBytes();
+}
+
+Uint8List _int32be(int value) {
+  return Uint8List.fromList([
+    (value >> 24) & 0xFF,
+    (value >> 16) & 0xFF,
+    (value >> 8) & 0xFF,
+    value & 0xFF,
+  ]);
+}
+
+void _writeChunk(BytesBuilder output, String type, Uint8List data) {
+  output.add(_int32be(data.length));
+  final typeBytes = type.codeUnits;
+  output.add(typeBytes);
+  output.add(data);
+
+  // CRC32 of type + data
+  final crcData = Uint8List(typeBytes.length + data.length);
+  crcData.setAll(0, typeBytes);
+  crcData.setAll(typeBytes.length, data);
+  output.add(_int32be(_crc32(crcData)));
+}
+
+/// Simple deflate with store (no compression)
+Uint8List _deflateStore(Uint8List data) {
+  final output = BytesBuilder();
+
+  // zlib header
+  output.addByte(0x78); // CMF
+  output.addByte(0x01); // FLG (no dict, fastest)
+
+  // Split into blocks of max 65535 bytes
+  const maxBlock = 65535;
+  var offset = 0;
+
+  while (offset < data.length) {
+    final remaining = data.length - offset;
+    final blockSize = remaining > maxBlock ? maxBlock : remaining;
+    final isLast = offset + blockSize >= data.length;
+
+    output.addByte(isLast ? 0x01 : 0x00); // BFINAL + BTYPE (store)
+    output.addByte(blockSize & 0xFF);
+    output.addByte((blockSize >> 8) & 0xFF);
+    output.addByte((~blockSize) & 0xFF);
+    output.addByte(((~blockSize) >> 8) & 0xFF);
+
+    output.add(data.sublist(offset, offset + blockSize));
+    offset += blockSize;
+  }
+
+  // Adler-32 checksum
+  var s1 = 1;
+  var s2 = 0;
+  for (var i = 0; i < data.length; i++) {
+    s1 = (s1 + data[i]) % 65521;
+    s2 = (s2 + s1) % 65521;
+  }
+  final adler = (s2 << 16) | s1;
+  output.add(_int32be(adler));
+
+  return output.toBytes();
+}
+
+int _crc32(Uint8List data) {
+  var crc = 0xFFFFFFFF;
+  for (var byte in data) {
+    crc ^= byte;
+    for (var i = 0; i < 8; i++) {
+      crc = (crc & 1) != 0 ? (crc >> 1) ^ 0xEDB88320 : crc >> 1;
+    }
+  }
+  return crc ^ 0xFFFFFFFF;
+}